[zhte415]

Guessing the number of hours could be difficult, as different people have different workflow.

I don't freelance, but I do bill hourly for consultancy work. I just calculate the number of hours in my calendar I've assigned, and work from that. It takes minutes per month (and I know what I'm doing based on the calendar).

In some cases lawyers bill by the minute. I'm not sure they use a specialized tool, and imagine it's more like an Excel sheet with time of call.

Sounds like an interesting technology, but limited not just to freelancers who use Git, but freelancers who use Git and have a similar workflow you use (and those that have a different workflow could raise hell regarding it not working for them, especially as it's about how much they request to get paid).

I also doubt many billed clients would like to hear their billable time was guessed or estimated.