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The question is not well-formed. Similar questions may include: How many minutes does a helium balloon stay aloft? How long does a hot air balloon stay aloft? How long does a particular rocket motor burn?
Eagles are exceptional gliders. So, as long as a bald eagle has lift beneath his wings, he can stay aloft.
Albatrosses are thought to stay aloft for 30 days at a time, but no-one sees them land on the water to rest. They do need a lot of wind to get them aloft again, so they probably try to keep that to a minimum.
The rotors provide lift to keep them up.
A plane with no engine is a glider. They use the air currents to stay aloft.
I don't know and I don't care either.
As long as you want. I think the question you are trying to ask is "How long can you stay in Chernobyl without dying?".
So the blimp will stay aloft/still adn will float.
they are using the power they have gained from flapping and gliding on the wind hope this aswers your question!
They can stay air-born indefinitely - provided there are enough thermal air-currents to keep them aloft.
Citizens can legally stay forever.
Nope. they use a tow plane to get airborne and then ride the air currents to stay aloft.