It's
10:00 ten o'clock
10:05 five past ten
10:10 ten past ten
10:15 quarter past ten
10:20 twenty past ten
10:25 twenty-five past ten
10:30 half past ten
10:35 twenty five to eleven
10:40 twenty to eleven
10:45 quarter to eleven
10:50 ten to eleven
10:55 five to eleven
11:00 eleven o'clock