Every time my students need to use the restroom, they are required to sign out on the restroom checkout sheet and sign back in when they return. This helps me to know exactly when my kiddos were in the restroom and also helps me if there happens to be an unexpected event such as a fire drill. I can quickly glance at the sheet and know who is missing. I put a digital clock on the table next to the sign out sheet so they can quickly sign in and out. I hope this helps keep your restroom procedures organized!