Being in a bigger space would be alot better I have to agree. You could put alot of toys and a comfy bed and etc in there and hed be ok.  Leaving himalone for all that time without anybody checking on him i dont think is very good.  I mean can you afford for somebody to come in 5-7 days a week and check on him, feed him, take him to go potty..etc... if not, is their anybody you can trust that will come over and check on him for you during the day?  Good luck!