Well it depends but you can look at it this way,

Mothers Nurse for two Years. that 240 Mins at Normal 480 at Slow/ 1/2 Speed and 120 at Fast speed.

This make

1 Year =

Half/Slow = 240 Mins
Normal = 120 Mins
Fast = 60 Mins

I'm sure I'll be corrected if wrong I'll just haft to face the music.