ラウンドトリップ時間 です
raun dotorippu jikandesu
1. Round trip time.
Noun
#512415
1. Round trip time.
1. period of time; time slot
2. time zone
1. short time
1. rest period; intermission
1. office hours; business hours
1. business hours; opening hours
1. permanent vice-president; undersecretary
1. long time; several hours