Time duration of jai stretches

I’ve found a lot of information about how to do jai stretches but I haven’t found anything that says anything about reps? For someone just starting out in PE how should I go about this?

In general do people do stretches for durations of time or as repetitions?

You couldn’t have looked that hard dude. Supposed to start at 15 reps, one minute rest between “sets”.

Standard time is 2 seconds out and in, breathing in when you stretch out. I do 3 secs however. JAI’s are awesome btw.

Thanks

How many sets shall I do?