This will make you all feel better - I have had two cockers, the first took around 6 months to be house trained, the current one, who is 15 MONTHS old, still wees and poos inside occasionally. He is out many, many times a day and can toilet outside then a short time later just go inside without asking (he jangles my keys in the front door when he wants out). He is a very headstrong, stubborn little
and I have spent the equivalent of around 6+ hours a day over the past 13 months outside saying "wee" or "poo".
Ironically, I can leave him alone for up to 4 hours and I come back to a clean house.... Go figure