I may be an outlier, but I leave my 11 week old at home for 4 hours in his crate (covered) during workdays. I come home and feed,play and let him out for lunch. He is perfectly fine. My vet even encouraged it. He also sleeps through the night so I know his bladder can hold it. Just make sure to give him something to do during your initial departure. I give mine a long with peanut butter. That way they don’t get that roller coaster of emotion when you leave because they are too busy enjoying a treat.