holding staic positions

Hello! this is veyr improtant to me. Static positions. I can almost do 3x30s L-sits. After reading the book and loking at a few people online, some people recommend, with staic positions, you do 6x10s. If thats the case, thats fine. But with every staic hold (front lever tuck, advanced bl tuck, advanced frog stand, straddle l-tuck) i have been doing 3x30s. Is this bad? Am i doing an unessicary amount of work, or is it good becasue i am making sure i am able to do them solidly for a long time before i progress. Or does it not matter? please let me know as soon as possible. Thank you@!

Maybe 6x10s if your max is 20s.

But the goal tends to be 3x30 or 60s.