If you are inhaling, not long enough.
It will take 5,104.1 gallons of water to fill this cylinder.
3 months, 8days, 2hours, 17mins, 43seconds
Depends how big the hole is!
depending on water pressure about 6 hours
it only depends on pressure at which the water flows into the gallon
Two days. Fill for one day. If not completely full, Continue on second day.
615,142 gallons of water are needed to fill this cylinder.
I would say a couple of hours, maybe even 3!
mine took 36 hours - the water fill was about 55 degrees
When you inflate a balloon, even on land, you pinch the mouth of the balloon shut to stop air escaping once you have run out of air. You can do the same thing underwater. Take a breath, dive under, and blow into the balloon, and pinch it when you run out of air. You could also use a snorkel, but you will need to make sure you leave enough air in your lungs to blow water out of the snorkel.
how long will it take to fill a 3998 gal above ground pool, with a standard water hose
That depends on the amount of water that comes out of the hose over a given period of time.