Increase Appointments+ booking time to days

Im considering to use the Appointments+ plugin into a website for booking sailing boats on a weekly basis. So how can i change the Appointments time interval up from 720min max thats now, to 60days. and minimum to be 1 week. This plugin has all the extras i require so far, and only this time config issue creates me problem. Is it possible to increase the range of the booking times so i can use it? Thank you in advance