Our Emma is a year and a half, and the longest I leave her in the crate is 6 hours. I am lucky to work part-time, 5 hours most days. When I do have to work a full day I run home at noon (or my husband does or occasionally a neighbor) and let her out. With our last boxer, I was working full-time and she was never crated, so she had the run of the house for 7-8 hours and did fine (I think she slept 75 percent of the time). It is not so much that I think her bladder is going to burst (our present boxer), I just don't think she should be crated that long and want to give her a break. When she is 2 we will give her the run of the house, and if she does OK we will leave her for a full day. I think when they can look out the windows, play with their toys, interact with the other pets (in our case, a cat), etc., it is not so bad to leave them. I always give them special attention, exercise, when I get home.