Yes, Romeo is a chi and he can be left alone for that long. they are just like other dogs, only little! lol
Im sure romeo would like a small friend tho... but still, with some toys, and usually a potty break (or somewhere to go potty) and a WALK when I get home, that would be fine
Dont get two dogs unless you really WANT 2 doggies, IMO getting 2 just so one will have company really isnt a good idea. having 2 dogs is a big responsibility, its much harder to find people to dog sit, travel with them, vet care etc..