The rule of thumb is very simple. If you wear any restrictive device, be a cock ring, restrictive ring, or even a constrictive device or method, as long there is a way for blood to leave the penile body at least 50 prevent in volume, compared to an erection state, after five minutes without you try to get more blood in from kegel exercises or a quick erection, that is a good starting point. Trapping old blood for too long without cycling it out after 10 minutes repeatedly is asking major troubles down the road. You may not see it at the start, but will slowly builds up and everything comes all at once like a bursted dam.
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