1 million dollars
Depends on how much you borrow from it.
Nobody decides how much money the government has to borrow. When the government wants to borrow money it has to issue or create debt with the US Treasury.
This depends on how much money you already have. Also, if you have a low paying job, then you won't be able to borrow as much as someone that has a well paid job.
when you borrow to much money
Alot.
how much is the grant worth, does it have to paid back,
endless amount
Yes.
1 million dollars
As much as you want, if you either have or can borrow the money to do it.
none
There are many 'How much can I borrow' mortgage calculators available on the internet. Many of them can be found on the websites of banks and other institutions like that.