5 minutes
no, but they can stay underwater for a long time
Not very long. Neptune is made of Hydrogen and helium. So you can't breath.
30 minutes.
it can stay out for several hours, however after that it will begin to slowly suffocate as it can only breath correctly under the water.
Spotted dolphins can hold there breath under water for 7 to 8 minutes
Dolphins and Whales can stay under water for so long is because they have blowholes to come to the surface and get air. They can stay under water for quite a while before they need another breath at the surface:) Need more help... Just ask!!!!!!!!!!!!!!
Most sea-creatures have gills, which filter the water & turns it into oxygen for them. Others can just hold their breath for a long time.
No, as long as you stay calm then you don't have to hold your breath.
they can hold their breath and use it for something else
Yes they can. They are mammals. They don't have those things that fishes use to breath. They breath from the hole on their head, and when they stay in the water FOR A SUPER LONG TIME they can't breath, and they die. I'm pretty sure.
Humans can't breathe underwater, unless assisted by either a snorkel or some other sort of air supply. With such a supply, there's really no limit to how long a human can stay, and breathe under water.
A human cannot change into a fish