@shelbycmr Probably about a month and a half. I did the workouts in typical sets and reps. 3 sets of 5 or so holds on each side.
This is the exact video I used. It's no nonsense and straight forward.
@shelbycmr I was able to do the human flag by watching a tutorial on YouTube. Indeed it takes focused strength, but technique is super important. There are variations you can do to prepare you for the full pose.
Edit: Here is a link to the tutorial!
You can do it!!!