Help grammar 6 sentences

Hi experts,
Can you help correct the grammar of the below?

1/He's only coming in for the internship 20 days, but we'll consider it a month on paper.
2/This is the country with the most girls with...
3/How big do you want the shirt to be?
4/This is beyond my control
5/There is 3 hours of sleep to be had.
6/The supermarket is as far as your house on average for every household. We're lucky that it's this close to our house.

The help is much appreciated