I have the Hamilton scuba and can confirm it will last 80hrs
The watch is very well built with a nice slightly domed crystal, which I like. It is a bit thick but wears very nicely and keeps good time. The only minus points are that the only polished parts are the highlights in the centre of the strap, and the fact that it doesn't taper as I would prefer.
Overall, I think it's prety good VFM, or was when I bought mine a couple of years ago, helped by a voucher from mrs. Beanie buying a ring from the jewellers.