diff --git a/app/views/admins/courses/index.xlsx.axlsx b/app/views/admins/courses/index.xlsx.axlsx
index 934ca845c..a276fe470 100644
--- a/app/views/admins/courses/index.xlsx.axlsx
+++ b/app/views/admins/courses/index.xlsx.axlsx
@@ -17,7 +17,7 @@ wb.styles do |s|
         get_attachment_count(course, 0),
         course.informs.size,
         course.course_videos.size,
-        course.course_videos.map{|cv| cv.watch_course_videos.map(&:total_duration).sum }.sum,
+        course.course_videos.map{|cv| cv.watch_course_videos.map(&:total_duration).sum }.sum.round,
         course.live_links.size,
         course.course_homework_count("normal"),
         course.course_homework_count("group"),