Stamina

Note: This is taken directly from VS Battles wiki.

Stamina, also known as Endurance or Staying Power, is an attribute that allows a certain character to remain active, exert itself to prolonged periods of time, and recover from ordeals.

Take note that we have no set categories for describing this attribute, so you should preferably rather describe the stated or displayed extent for a certain character.

For example: "The official handbooks have described Thor's stamina as virtually inexhaustible. He once fought an army of frost giants for 9 months without tiring."