Hourly schedules

I need to know how to set up the scheduling page so customers can choose how many hours they would like to rent our procucts.

I see there is a way to make appts each hour, but if a client wants to book for 4 hours, I do not what them to have to make 4 bookings

How can I set this up to allow the customer to choose how many hours?

You can create different appointment types.  One appointment for a four hour period. The second appointment type for a five hour period, etc.   You can also make one appointment type for a four hour period and then create Add-Ons for the additional hours.

Have you tried Calday https://calday.app/? It has most of the things you need I think. Super simple, not sure if you need anything with more bells and whistles. You can provide communication, which is the most important thing for project management, in the most effective way.