RonFrank
Contributor
Any type of diver can end a dive for any reason at any time. It is hardly a technical requirement, in fact quite the opposite.
I generally dive until NDL, or I get cold, bored, etc.
On a shallow dive in FL (25'ish depth), it is hardly unheard of to go two hours if shore diving, and end it only because 2 hours is plenty of time underwater. On a boat that will never happen as they want folks back in the boat after one hour as they have schedules to keep. I find one hour on most shallow reefs is adequate.
For deeper dives, it will be NDL based. For example diving Boyton (FL), the depths can be 100' at times and even diving Nitrox it's difficult to get bottom times of more than 50 minutes without going into NDL.
I once was partnered with a couple who could not get 30 minutes on a 80 at 25' before they were low on air. Not problem, I would return them to the boat, and go back down for the rest of the time solo.
As a new diver, you will suck air. Give it time, and you likely will improve. The main goal is SAFETY and then enjoyment.
I generally dive until NDL, or I get cold, bored, etc.
On a shallow dive in FL (25'ish depth), it is hardly unheard of to go two hours if shore diving, and end it only because 2 hours is plenty of time underwater. On a boat that will never happen as they want folks back in the boat after one hour as they have schedules to keep. I find one hour on most shallow reefs is adequate.
For deeper dives, it will be NDL based. For example diving Boyton (FL), the depths can be 100' at times and even diving Nitrox it's difficult to get bottom times of more than 50 minutes without going into NDL.
I once was partnered with a couple who could not get 30 minutes on a 80 at 25' before they were low on air. Not problem, I would return them to the boat, and go back down for the rest of the time solo.
As a new diver, you will suck air. Give it time, and you likely will improve. The main goal is SAFETY and then enjoyment.