Does the 12 hours for the pit stop start as soon as you check in? If so, it would seem that the front running teams would be getting ready to leave when the guidos and terri and ian were arriving.
Yes the 12 hours starts from check-in time. Charla and Mirna had a long time to wait for the ferry. They (and Cha Chas) left at 5 am. The Guidos ferry left at 8pm later that day. So assumming they did all tasks within the same general time frame I'm sure C/M and Cha Chas have already left the pit stop. Not really sure about the second round of teams though. They would be very close because I think their boat left at 8am.