I really wouldn't suggest getting a 2nd dog to make up for your pup being left... the real danger is that they will team up too much with each other making your training ten times more difficult.
DTrubs and chris - I truly hope your pairs continue to cause you no difficulty, but it is often the case that the problems arise as the dogs reach adolescence...
Or when they need to be seperated for some reason (health issues). I'm not saying it can never work, but there are serious potential pit-falls. I am saying this as someone who initially seriously considered getting two puppies for the very reason we are discussing it here... and I can honestly say I am so glad I didn't!
It is possible to manage working with puppy ownership, but 5 hours every day with no break is not a workable arrangement. We were very limited as to the time we could take off when we got Honey - OH had the week off then we were both at work... we worked very hard during the week to build her up to spending time alone, and I juggled my shifts to make life as easy as possible for her. We also had the help of a friend who would visit at lunchtimes if needed. From a fairly early age she was able to be left up to 4 hours at a time (but this wasn't every day) and, to ensure we still built a good relationship with her, we had to make sure every other minute of our life was focussed on her for many, many weeks.
Even now, I would be reluctant to leave her for 5 hour stretches every day... though she does cope with an occasional long day if our arrangements have fallen through for any reason (this has happened twice in the 18 months we've had her).
Is there any way you could get someone to visit part way through the day (about 11am?) just to break up the day for her - a dog walker or reliable neighbour?