Can I set up rentals by minutes?

Yes, you can do this. In the rules, click Configure time. Then, click the Add period button or open an existing period to edit it. Specify the working hours for the resource.

Next, click Add step, or edit an existing step. Select Custom time, then choose Custom settings.

Then, set the recurrence by specifying the hours and minutes.

The calendar settings will appear as follows:

Here is a demo with 15-minute intervals: