A real life Neutron Star.
He gets dropped onto the surface of one and has to be alive after 10 minutes of exposure to the thing.
Quick facts about Neutron Stars:
Him getting dropped onto one would result in an explosion more powerful then every nuke ever detonated added together. By a lot. I dont have exact numbers here, but let's say 10x stronger then every nuke added together.
The "atmosphere" of a Neutron Star is only a few centimeters of carbon gas. This gas is approximately 1 million degrees in temperature and moving at 34% the speed of light.
Other harmful factors would be the continuing crushing tidal forces of gravity (typically between 1.4 - 2.4 solar masses) and the various radioactive emissions associated with Neutron Stars.
Can Hulk last 10 minutes?