It depends a lot on the weapon and rate of fire. A rapid rate of say 200+ per minute will require a change about every minute, while a slower rate of say 100 might only need a change every 3-4 minutes even though more rounds have been fired through it.
Note also that it's EXTREMELY rare for a weapon to have more than one spare barrel, so chances are in a heavy battle, the "spare" is still scorching hot when it's put back on the weapon for another turn.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
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