Our team has it figured out. Since leadership wants us to collaborate face to face, we all show up around 9:30-10:00 a.m. to avoid traffic, stand around visiting for a few hours, all go out to 2 hour team lunches (the restaurants around the office are so much better than in our suburbs!), come back and visit some more, and leave around 2:00 p.m.
Office days are the best!