There are several different ways to say time in the U.S. For example:
For 6:05 you will hear 6-oh-5, 5 after six, or 5 minutes after six
For 6:10 you will hear six-ten, ten after six, or ten minutes after six.
For 6:15 you will hear six-fifteen, quarter after six, fifteen after six, or fifteen minutes after six
For 6:40, you will hear six-forty, twenty minutes to seven, or twenty to seven.
For 6:45, you will hear six-forty-five, quarter to seven, 15 to seven, or 15 minutes to seven
Etc., etc.,