Event Duration Analysis

Hi all!

I have a table which records device usage in my business. It records the device name, the time in, and time out.

The long and short of our goal is this: to be able to calculate how many hours each day the devices are being used (not each individual device, I don't think, but all devices together), and to be able to isolate which times of day in particular they are being under-used.

A device has a 12 hour period each day where it can be used, and there are 6 devices, so in total we're comparing time the devices checked out to 72 hours (maybe with some kind of pie chart or something showing what percent of 72 hours the sum of use-time is).

I was also envisioning some sort of graph that looks like this, to illustrate device checkout times:

Anything powerBI can do to make these tasks easy for me?