Mastering Basics

So I have everything down other than a planche, but I am wondering how long must you hold a certain static hold with correct form to feel like its mastered?

I'd say 5x10 seconds with maybe 30-60s rest.

if u want te get better at planche just learn how to hold a back lever for about 20 seconds with good form.u will see alot of resluts on ur planche. 

and do 5x max hold and rest about 2-3mins