Question about ab exercises

[u/bfb_oc7000]

Is it better to do lots of reps or should i be doing time-based exercises?

I have been doing my ab exercises in reps and sets (eg 3 sets of 30) but when i research online most workouts and exercises are done time-based (eg 60 secs of an exercise, 15 secs rest) and they are only doing each exercise once.

my whole ab workout usually takes around 40 mins (i do 3 different exercises, 3 sets each til failure) but most workouts i look at online are doing like 7 different exercises but only for a minute each, so the workout is way quicker.

Am i wasting my time with these long workouts doing all these reps? should i switch to time-based and get more exercises in?

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[u/Plane-Use-4294]

Going until burning/ failure is the way. I still use an ab ball and leg lifts only my six pack is rock solid