Philontour,
Response time after stage 1 seems to be highly variable. I took just over a week to get mine, which is about the fastest anyone seems to get them (don't think I've heard anyone get stage 1 results in only a few days, but I'm prepared to be corrected...), but on the other hand quite a number of people have had to wait up to the full 15 working days (3 weeks).
As you say, the wait is horrible (I'm currently itching for the results of my stage 2) and I feel for you, but I suspect that after only a couple of days you're going to have to hang in there for a while yet.
I don't think you have to wait shorter or longer depending on whether you pass or fail, generally at stage 1 most people from the same dates seem to get them at the same time regardless of the result. It might be that if you are borderline it could take them a little longer to get back to you, but that's just speculation.