The easiest two ways are to either pay per mile, or just add the round trip time to whatever their pay is. There might be some small complaints and attempts to abuse. But the complaining is easy to deal with and I think the abuse would be small and could be dealt with in similar ways as other time theft is dealt with.
You can also play with it to try and get closer to correct. I had problems with getting an Excel macro working and getting unattended-updates working on my pihole. GPT was wrong at first, but got me partly there and I could massage the question and Google and get closer to the right answer. Without it, I wouldn’t have been able to get any of it, especially with the macro.