Depending on what test you do...takes between 7 and 15 minutes per radio. There are also some tests which can be skipped at times. For example, I used to do a bunch of XTS2500's that operated on the local trunking system. They were utilized in digital only and used by a local university for operations (nothing public safety)...so I'd typically not waste the extra 6 minutes to perform the analog function tests (SINAD, analog distortion, analog deviation, etc).
OK, even the 15 minutes is manageable.
Our PD system has about 30 portables and 10 or so mobiles. Some of those are 6-7 years old and need some touch up. Should have been done long ago, and I thought they'd sent them off to a local shop to be done, but I guess not. We're going to replace those radios, and I want to get in the routine of running them through every year, or more frequently if we suspect something is wrong.
Then there's 450 or so Kenwood NX-900's, NX-410's, NX-420's, NX-3400's that I'd like to start running through. Having a shop come in a do those periodically would kill us, so DIY is my long term plan.
Then some Bridgecom UHF repeaters that someone bought that I've become responsible for. I'd feel more confident with the right test equipment and not sending everyone off to a shop for $85/hr.
Now the harder part will be typing up the justification. The writing it is the easy part. Putting it into terms that non-radio people will understand is the challenge. Since most people don't get their cars tuned up anymore, I'm going to have to find an analogy they will understand.