Personally, I do the bulk of the edit in about 2:00 - 2:30 hours, especially large edits can take up even 3 hours, that's if you need full body tatto + skin edit. But I'm talking about highres arts, but for lowres (lower than 1.8k × 1.8k) skin edits is more that quick, in about 15 minutes.
I think I do this very slowly, so I ask other editors, how much time do you spend on your edits?
(If anything, I do it all on my phone.)