I wouldnt consider have 2 pups together, especially cockers irrelevant of whether i worked or not. Taz has been hard enough work as it is, even with Kelly (my 13 year old collie cross) training him manners indoors. I would leave it until at least you have the 1st puppy trained.
As for leaving for long periods, i am very much of the opinion that it depends on what you do with the dog when you are there as much as when you are not there. Taz gets a 30 minute brisk walk before i go to work, then when i get home most of my time is spent with the dogs (including about 1 - 1 1/2 hours at the park). I also do agility and obedience training with Taz. I know people who have dogs, who rarely leave them, but couldn't be more disinterested in the dog if they tried - very rarely walked, no training, etc.
When i had my Kelly from the RSPCA as a puppy i worked 3 days a week when she would be left 5 hours. The RSPCA were aware of this and their guidance at the time was 6 hours maximum for a pup. Fortunately my son's have been around most of the day since i had Taz, although they spend most of the time in their bedroom, the back door is left open so they can go in the garden.
In a perfect world, i think most of us would prefer not to work but to stay at home with our dogs all day, but most of us have to work! Eitherway, my dogs couldnt be more loved by anyone else and are both well-balanced dogs