Okay, now let me preface this by saying that I think overworking employees is no small issue and I think that caution should be exercised for the health of everyone on the dev team with regards to crunch time development.
But if I were on the Smash 4 Team, I'd probably treat the whole development period like a giant goddamn sleepover. Being in a building with a bunch of talented devs and Sakurai himself, I'd probably just sleep in my cubicle, bring food to eat and stuff. I mean, I know in romanticizing it, but it sounds kinda fun.
Again, workers being stretched to and beyond their limits is bad. But if it's a good and friendly environment like I imagine this one is then I bet it'd be kinda fun in the way that persevering through a demanding situation forges bonds.