diff --git a/src/components/CourseRegister/StartButton.tsx b/src/components/CourseRegister/StartButton.tsx
index 2b82a09..931a44a 100644
--- a/src/components/CourseRegister/StartButton.tsx
+++ b/src/components/CourseRegister/StartButton.tsx
@@ -1,42 +1,155 @@
+import {useEffect, useState} from 'react';
 import styled from 'styled-components';
+import {useDispatch} from 'react-redux';
 import {deleteAllRegistrations} from '@apis/api/course.ts';
+import {setEndCount, setTime} from '@/store/modules/courseRegisteredSlice';
+import {FilterWrap} from '@/styles/FilterLayout';
+import {useAppSelector} from '@/store/hooks';
 
 interface StartBtnProps {
   onClick: () => void;
 }
 
 function StartButton({onClick}: StartBtnProps) {
+  const dispatch = useDispatch();
+  const time = useAppSelector(state => state.courseRegistered.time);
+  const [timeout, setTimeout] = useState<number | string>(time);
+  const [timeLeft, setTimeLeft] = useState(35);
+  const [isRunning, setIsRunning] = useState(false);
+  useEffect(() => {
+    if (!isRunning || timeLeft <= 0) return;
+
+    const countdown = setInterval(() => {
+      setTimeLeft(prev => prev - 1);
+    }, 1000);
+
+    return () => clearInterval(countdown);
+  }, [isRunning, timeLeft]);
+
+  useEffect(() => {
+    if (timeLeft === 0) {
+      setIsRunning(false);
+      setTimeLeft(time);
+      dispatch(setEndCount(true));
+      console.log('제한 시간 초과');
+    }
+  }, [timeLeft, dispatch]);
+
   const handleClick = async () => {
     if (!confirm('수강신청 연습 시작하시겠습니까?')) return;
 
+    //카운트다운 중에 재시작
+    if (isRunning) {
+      setTimeLeft(time);
+    }
+
+    setIsRunning(true);
     await deleteAllRegistrations();
     onClick();
   };
 
+  const handleInput = (e: React.ChangeEvent<HTMLInputElement>) => {
+    const timeInput = parseInt(e.target.value);
+
+    if (e.target.value) {
+      setTimeout(timeInput);
+      setTimeLeft(timeInput);
+      dispatch(setTime(timeInput));
+    } else {
+      setTimeout('');
+      setTimeLeft(35);
+      dispatch(setTime(35));
+    }
+  };
+
+  const formatTime = (time: number) => {
+    return time.toString().padStart(2, '0');
+  };
+
   return (
     <Container>
-      <p>시작 버튼을 누르면 수강 신청이 시작됩니다. 다시 연습하고 싶다면 한번 더 버튼을 눌러주세요.</p>
-      <p>시작 후, 35초가 지나면 모든 과목이 수강여석 없음으로 변경됩니다.</p>
+      <p>
+        시작 버튼을 누르면 수강 신청이 시작됩니다. 다시 연습하고 싶다면 한번 더
+        버튼을 눌러주세요.
+      </p>
       <p>현재 상태를 확인하고 싶다면, 재조회 버튼을 눌러주세요.</p>
-      <ButtonWrap onClick={handleClick}>시작 / 초기화</ButtonWrap>
+      <ul>
+        <p>제한 시간 안내</p>
+        <li>기본 설정: 35초</li>
+        <li>최소 시간: 10초 (10초 이하 입력 시 자동으로 10초로 조정)</li>
+        <li>
+          최대 시간: 1시간(3600초) (1시간 이상 입력 시 자동으로 1시간으로 조정)
+        </li>
+        <li>
+          설정한 제한 시간이 지나면 모든 과목의 수강여석이 없음으로 변경됩니다.
+        </li>
+        <h5>※ 초단위로 입력해주세요!</h5>
+      </ul>
+      <TimerWrap $isAlmostDone={timeLeft <= 5}>
+        <span>{formatTime(Math.floor(timeLeft / 60))}:</span>
+        <span>{formatTime(timeLeft % 60)}</span>
+      </TimerWrap>
+      <InputWrap>
+        <span>제한 시간</span>
+        <InputBox type='number' value={timeout} onChange={handleInput} />
+        <ButtonWrap onClick={handleClick}>시작 / 초기화</ButtonWrap>
+      </InputWrap>
     </Container>
   );
 }
 
 const Container = styled.div`
+  font-weight: normal;
+  > p {
+    font-size: 1.6rem;
+    margin-bottom: 1.5rem;
+  }
+  > ul {
+    font-size: 1.6rem;
+    margin-bottom: 1rem;
+
     > p {
-        font-weight: normal;
-        font-size: 1.6rem;
-        margin-bottom: 15px;
+      font-weight: bold;
+      margin-bottom: 1rem;
+    }
+    > li {
+      list-style-type: square;
+      margin: 0 0 0.7rem 2rem;
+    }
+    > h5 {
+      color: ${props => props.theme.colors.primary};
+      font-weight: bold;
     }
+  }
+`;
+
+const InputWrap = styled(FilterWrap)`
+  margin: 1.5rem 0;
 `;
+
+const InputBox = styled.input`
+  height: 2.4rem;
+  border: 1px solid ${props => props.theme.colors.neutral4};
+  padding-left: 0.5rem;
+  width: 21.5rem;
+`;
+
+const TimerWrap = styled.div<{$isAlmostDone: boolean}>`
+  ${props => props.theme.texts.title};
+  margin: 1.5rem 0;
+  font-size: 2.5rem;
+  letter-spacing: 0.5rem;
+  color: ${props =>
+    props.$isAlmostDone ? props.theme.colors.primary : 'inherit'};
+`;
+
 const ButtonWrap = styled.button`
   ${props => props.theme.texts.content};
   background-color: ${props => props.theme.colors.primary};
   color: ${props => props.theme.colors.white};
   width: 8rem;
   height: 2.4rem;
-  margin-bottom: 10px;
+  margin-left: 1rem;
 
   &:hover {
     filter: grayscale(15%);
diff --git a/src/components/CourseRegister/index.tsx b/src/components/CourseRegister/index.tsx
index 8414842..1cb7776 100644
--- a/src/components/CourseRegister/index.tsx
+++ b/src/components/CourseRegister/index.tsx
@@ -52,7 +52,7 @@ function CourseRegister() {
 
   useEffect(() => {
     dispatch(setEndCount(false));
-  }, []);
+  }, [dispatch]);
 
   const refreshAll = useCallback(async () => {
     const registeredCourses = await getRegisterdList();
@@ -89,11 +89,6 @@ function CourseRegister() {
     setIsRegistrationStarted(true);
     setIsFirstSearch(true);
     dispatch(setEndCount(false));
-
-    setTimeout(() => {
-      console.log('35초 지남');
-      dispatch(setEndCount(true));
-    }, 35000);
   };
 
   const handleAction = async (
diff --git a/src/components/Header/TopMenu.tsx b/src/components/Header/TopMenu.tsx
index f230491..480919f 100644
--- a/src/components/Header/TopMenu.tsx
+++ b/src/components/Header/TopMenu.tsx
@@ -7,6 +7,7 @@ import {useAppSelector} from '@/store/hooks';
 import {clearUserInfo} from '@/store/modules/userSlice';
 import logout from '@assets/img/logout.png';
 import Clock from './Clock';
+import {resetCourseRegistered} from '@/store/modules/courseRegisteredSlice';
 
 function TopMenu() {
   const navigate = useNavigate();
@@ -15,6 +16,7 @@ function TopMenu() {
 
   const handleLogout = () => {
     dispatch(clearUserInfo());
+    dispatch(resetCourseRegistered());
     delete baseAPI.defaults.headers.common['Authorization'];
     Cookies.remove('accessToken');
     navigate('/login');
diff --git a/src/store/modules/courseRegisteredSlice.ts b/src/store/modules/courseRegisteredSlice.ts
index 86694df..4769494 100644
--- a/src/store/modules/courseRegisteredSlice.ts
+++ b/src/store/modules/courseRegisteredSlice.ts
@@ -1,25 +1,48 @@
 import {createSlice} from '@reduxjs/toolkit';
 
 export interface CourseRegistered {
-  endCount: boolean
+  endCount: boolean;
+  time: number;
 }
 
 const courseRegistered = createSlice({
   name: 'courseRegistered',
   initialState: {
     endCount: false,
+    time: 35,
   },
   reducers: {
     setEndCount(state: CourseRegistered, {payload}: {payload: boolean}) {
       state.endCount = payload;
     },
-
+    setTime(state: CourseRegistered, {payload}: {payload: number}) {
+      if (payload <= 10) {
+        state.time = 10;
+      } else if (payload >= 3600) {
+        state.time = 3600;
+      } else {
+        state.time = payload;
+      }
+    },
     clearCount(state: CourseRegistered) {
       state.endCount = false;
     },
+    cleatTime(state: CourseRegistered) {
+      state.time = 35;
+    },
+    resetCourseRegistered(state: CourseRegistered) {
+      state.endCount = false;
+      state.time = 35;
+    },
   },
 });
 
-export const {setEndCount, clearCount} = courseRegistered.actions;
+export const {
+  setEndCount,
+  setTime,
+  clearCount,
+  cleatTime,
+  resetCourseRegistered,
+} = courseRegistered.actions;
 
-export default courseRegistered.reducer;
\ No newline at end of file
+export default courseRegistered.reducer;