I used to wait until the last one was gone before doing any cleaning/tidying up etc...but my hours are 6-6 and then to spend another hour cleaning before even getting to our dinner and nightime activities were just too much. So now...at 5:00 I usually only have 1-2 left and that's when the TV goes on in the playroom. While they watch a little treehouse, I vacuum up the playroom, mop the floors, wipe down the toys and tidy up the kitchen and start getting our dinner ready. This way, we eat at 6 when the last one leaves and then have the rest of the evening. This will change once soccer/baseball season starts though as we will have to eat and be ready to walk out the door at 6:01 to make it to their games on time....I think I need to change my hours to end a little earlier...last year was stressful!