How long will the online medicine without prescription just the repair process take? (not the shipping process)

Will i get my same console back or atleast a halo 3 edition console back?
My problem was one red ring at the bottom right corner.
unfortunately 4 me this is the second 360 console i have had "break" on me. I use a intercooler to help keep it cool. Could that be why my consoles keep breaking down?