If you find yourself frequently doing rentals of the same duration then you can set up shortcut buttons in your When panel.
Press the little cog to access your settings.
Putting options in here will create buttons in the when panel corresponding to your choices:
m = minutes
h = hours
d = days
you can use a comma to separate multiple values.
Please note that this field can also be accessed from this page:
Settings > Reservation Settings:
