Wrist prep exercises - how often?

Hey, 
I'm been doing some wrist strengthening exercises (Wrist pushups, fingertip walks etc) and i was wondering how often you guys train them? They are helping immensely, but I have a tendency to overdo things, and want to avoid that, especially with a movement thats supposed to be pre-hab. I've been doing them about 3 times a week, sometimes I do some wrist pushups or walks to warm up before I do some ring or planche work. 

I do them 2 times for a week, 3 is to much for me and always leads to discomforth in one of wrists.

I do normally one or two sessions low intensity/ high volume and one session high intensity/ low volume.

Us who do wrist prep work follow Handstand 1. You should check out the program in case you have not already done so. Furthermore you can have feedback on your forearm headstand too, which is a part of Handstand 1 as well.

I think I remember reading that once you have the final progression mastered, a single set at the beginning of each workout is all that's needed.