40 minutes
A time
The phrase "twenty past ten" refers to the time 10:20. It indicates that it is twenty minutes after ten o'clock.
ten past ten!
Ten minutes past six.
It is: ten to eight
10:15
4:10
2:10
You can say "It's half past ten" or "It's ten thirty." Both phrases convey the same time, indicating that it is thirty minutes after ten o'clock.
10 minutes past one
one past ten
Ten minutes to two