I'll chime in on this since I'll be working with DW in impound this year and we just discussed this.
You have the 4 hours max to service your vehicle in impound after your qualifying run. The following day DW and I will be there at approximately 6am to allow you access to your vehicle. You'll have about an hour to get it together as the gate closes behind all the racers headed out for their back up runs at 7am. Be out the gate or moving towards it at 7am or you won't make that second pass. We will of course try to be as "racer friendly" as possible but the other racers needs us to be as prompt as possible so we don't hold up the show.
The short version............yes, but your time in the morning at impound is very limited.
The impound directions are in the newsletter in your SW tube as well.
DW, care to add anything??