In your pocket
My chip
In the rooms, time is marked with a medallion pressed into your palm. Keep yours here too: your days, your milestones, and the next chip ahead.
24Hours
Counting days is not the point; living them is. If you go back out, you do not lose what you learned. Come back, reset the date, and take the 24 hour chip again; plenty of us have. The meetings page is right there when you need a room.