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it doesnt really matter.
im guessing you might be new to this, so generally I would start off doing 30 seconds high intensity, then 60 slow resting intensity. no matter if its 30/30 or 30/60 or 60/60 or 90/60 theyre all intervals, you will be able to increase it as you get better, if you even need to increase it, you may be fine sticking where you are at with the 30/60.
I would warm up with a good 5 minute slow-medium pace, then start your intervals, do as many rounds as you can really... try to aim for 7 rounds which would at least get you 10 minutes worth of intervals, and just like your fast/slow ratios, you can add more rounds of intervals as you get better.... after your done, cool down with a 5 minute slow jog or even walk.
This is just how I was taught to do it, which is pretty consistent to how everyone else does, or has started there intense interval training.
good luck
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