Comment by zamadatix

The Sun consumes a mass equivalent of a mount Everest worth of hydrogen via fusion to shine for just an hour (or thereabouts, if I did my math right :)). For perspective, this amount of energy is more than enough to power the Earth's current electrical usage for over a billion years.

That's all before getting into how a containment failure doesn't imply "and then everything nearby just started a self sustaining fusion reaction". The confinement itself is a key part of what enables the conditions for the fusion to continue.