hardstyle plank

Hi, I am beginning my bodyweight training with learning how to do the hardstyle plank using the GTG method. I am a little confused on how to think about changing reps into time held in the plank and is there a limit to how many sets I should do throughout the day? Any help would be appreciated.

Hello Has anyone created or able to recommend a hard style plank program for someone that is new to strength training? I was thinking of building it using GTG but unsure how to assess or determine volume and frequency per week. Currently this person can do a normal plank and a couple of...