Can i park my car here for 6 days? Is there a walkway from garage 2 to the departure terminal?

There is a covered walkway to the main terminal, but note that almost all departures take place from other terminals. Right now the fee is $6/hr up to $17/day. This could change at any time, so I suggest checking the airport site before you park. Forme, a taxi to/from the airport is less expensive than parking for a longer trip.

Yes, price is $17 (I think, could have increased) a day. There is a walk way. I only use garage for short term. I have used long term uncovered lot for $10 a day. There is a shuttle that drops you at departure and collects you at arrival on return.