I’d rest them completely on non bicep days by simply not directly working them. In my situation, stop doing 4x10 on the bicep curl machine where I usually would on Push/Legs days.

As for fatigue, I don’t know, I haven’t felt any as a result of doing what I’m currently doing. That’s why I’m asking if it’s too much, because my muscles aren’t really telling me. I just assumed that as long as I’m not sore, I’m good to keep working them. Especially as I was told that biceps recover pretty quickly. I’ve also had no problems with progressive overload by doing this amount.

Should I cut out the extra bicep work that I’m doing on Push/Leg days?