>>/1549/
That's ~72 hours actually, so basically 3 days as in 50 pushups daily. Not saying you wouldn't be able to do that but that's a few more than 38 :)
>>/1552/
Why not just do intermittent fasting if you are really dead set on doing dumb shit? I mean it's probably better, you can do like 1 day normal maintenance calories and 1 day basically eating nothing.