I agree with the others. We almost always fly thru SJU and even if absolutely everything went perfectly, I don't think its possible with checked luggage.

Not to be overly dramatic but last trip, it took 30 minutes, after a 20 min walk, for our bags to come out (priority tagged). On the return, the TSA precheck line took 25 minutes. And a 12:20 estimate arrival might turn into 12:45 until you deplane.