If you mean on fourth of an hour, it's 15 minutes.
15 minutes.
30 minutes equal half an hour.
15mins
15.
There are 1 60th of an hour in 1 minute, as there are 60 minutes in 1 hour.
1 hr is 60 minutes. 1 fourth is a quarter or .25 .25 x 60 = 15
60 minutes equal one hour.
15 minutes
90 minutes.
255 minutes.
40 minutes = 2/3 of an hour