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[My Hero Academia] Does Deku have a limit to how much he can use One For All? The Quirk's descriptor is the ability to "stockpile power", is it possible for him to "run out" of power or can he use it indefinitely only worrying about physical backlash?
gpt
> Does Deku have a limit to how much he can use One For All?

Yes. The primary limit on One For All is the durability of Deku's body. He can use it until his arms and legs have been reduced to pulp.

> The Quirk's descriptor is the ability to "stockpile power", is it possible for him to "run out" of power or can he use it indefinitely only worrying about physical backlash?

The "stockpiling" refers to how it adds the quirks together. They aren't consumed when they are used (but it's conceivable that a different quirk that copies or absorbs powers could work this way). Deku's quirk seems to have no *endurance* limit.

Quirks vary greatly in how their limitations work. Todoroki's ice powers freeze his body until he goes into hypothermic shock, while his fire powers seem to have no such limitation (and he can use his fire powers to thaw his body and reduce the limitation on his ice powers). Uraraka becomes nauseous the more she uses her quirk, to the point of incapacitation, and using it on heavier things makes this happen more quickly. Kaminari gets dumber the more he uses his electricity powers. 

I would not be surprised if we eventually find out that there is a limit on One For All. If there is, Deku hasn't reached it yet.