expression, godan verb (-ru)
be punctual; keep time
Used for arriving on time, meeting deadlines, or generally respecting scheduled times.
彼はいつも時間を守る。
He is always punctual.
会議の時間を守ってください。
Please be on time for the meeting.
遅刻する means 'to be late', while 時間を守る is the positive act of being punctual.
Compound of 時間 (time) + を (object marker) + 守る (protect, keep). Literally 'to keep time'.