dlofting
Contributor
It's really more a question of understanding when to use it, because when it is really needed you won't be thinking about how long it will be on.That's true. Surfers are known to refer to them as The Landlord, but the odds of a shark strike are lower than killed by falling coconuts or a cow trapling. I've survived the latter.
Yeah, I wouldn't know how to use one safely if I had one. I hope the one I ordered has instructions. I can look them up now, but I'll forget. Google says up to two hours and the article said it was one & half boat ride.
An amputation or a bleed from something like the femoral artery are the obvious cases where a tourniquet will be required. The first case is unlikely in a scuba scenario but a prop wound could cause the second. If the wound is spurting blood you may have the second case on your hands. Hopefully never happens.