15: 50 13: 45 7: 25 8: 15 11: 30 8: 40

It's ten to four-15:50
It's quarter to two-13:45
It's twenty-five past seven-7.25
It's quarter past eight-8.15
It's half past eleven-11.30
It's twenty to nine-8.40

Three hours and fifty minutes, an hour and forty-five,seven hours and twenty five minutes,  eight hours and fifteen minutes, half of the twelfth, eight hours and forty minutes.