diff --git a/apps/friends-react-native/src/infrastructures/createTimetableViewService.ts b/apps/friends-react-native/src/infrastructures/createTimetableViewService.ts
index b658de9..7ea61af 100644
--- a/apps/friends-react-native/src/infrastructures/createTimetableViewService.ts
+++ b/apps/friends-react-native/src/infrastructures/createTimetableViewService.ts
@@ -11,8 +11,8 @@ export const createTimetableViewService = (): TimetableViewService => {
     },
     getHourRange: (timetable) => {
       const times = timetable.lectures.flatMap((l) => l.classPlaceAndTimes);
-      const start = Math.min(...times.map((t) => Math.floor(t.startMinute / 60)), 8) as Hour;
-      const end = Math.max(...times.map((t) => Math.ceil(t.endMinute / 60)), 22) as Hour;
+      const start = Math.min(...times.map((t) => Math.floor(t.startMinute / 60)), 9) as Hour;
+      const end = Math.max(...times.map((t) => Math.floor(t.endMinute / 60)), 17) as Hour;
       return [start, end];
     },
     getDayLabel: (day) => ({ 0: '월', 1: '화', 2: '수', 3: '목', 4: '금', 5: '토', 6: '일' })[day],
diff --git a/apps/friends-react-native/src/usecases/timetableViewService.ts b/apps/friends-react-native/src/usecases/timetableViewService.ts
index ca6f228..5f6e39c 100644
--- a/apps/friends-react-native/src/usecases/timetableViewService.ts
+++ b/apps/friends-react-native/src/usecases/timetableViewService.ts
@@ -4,7 +4,7 @@ import { FullTimetable } from '../entities/timetable';
 
 export type TimetableViewService = {
   getDayRange: (table: Pick<FullTimetable, 'lectures'>) => [Day, Day];
-  getHourRange: (table: Pick<FullTimetable, 'lectures'>) => [Hour, Hour];
+  getHourRange: (table: Pick<FullTimetable, 'lectures'>) => [Hour, Hour]; // Note: [9, 17] 이면 9:00 ~ 17:59 를 의미한다
   getDayLabel: (day: Day) => string;
   getLessonColor: (lesson: FullTimetable['lectures'][number], palette: Color[]) => { bg: string; fg: string };
 };