Changing minutes to hours in confirmation section

All of the services that we'll be implementing on this site are either 2-hr or full-day training appointments. When you select your preferred date and time, the box pops up at the bottom of the screen asking the user to confirm their appointment. Is there a way to change the "Lasts (approx.):" to be listed in hours instead of minutes? It looks kind of weird to list 120 minutes or 480 minutes.

Thank you!