To have money deposited instantly using Square you'll pay a 1.5 % fee of the amount you want instantly deposited.
For example if you want to instant deposit $50.00 using Square then you'll be charged $0.75 since 1.5% of $50.00 is $0.75
It's not really expensive to get an instant deposit using Square but it's not really cheap either but Square has to make money for providing the service so I would say in my opinion it's pretty reasonable.
The money will be deposited from Square into your bank account instantly as long as you're willing to pay the 1.5 percent fee.
Paypal only charges around $0.25 for an instant transfer from Paypal to a bank account which is cheaper but if you need your money instantly from Square you'll need to pay the fee.