I know this has been covered a bit before, but I have a more speicifc query.
I pitched Wyeast Ringwood ale into a porter when it was too hot, around 90 degrees. I put it right in my basement where it a steady 64 degrees and it seemed to cool down pretty quickly (within about 4-8 hours according to the temp sticker I was checking on the side of the carboy).
I have read on the forums that pitching too hot can lead to off flavors and fusel alcohols.
But how long does it have to stay hot to create those problems? If you pitch it too hot, but it cools down to the proper temp within 8 hours or so, will you still have a problem? It seems like the yeast is not all that active right away, so by the time they were getting to work, the wort would be at the proper temperature?