That's called Stalling and is a form of abuse, you can report the player via their profile.
https://support.chess.com/en/articles/8584203-what-is-stalling
https://support.chess.com/en/articles/8562517-how-do-i-report-someone
Rules about time
Sort:
I play 30 min. In the last game, after 15 mooves, I had 25 min , my adversary 27 min but he stopped mooving. So I had to wait 27 min to win. Is it normal?