This is another one of those writing questions I worry about too much. I was advised not have too many and certainly not have a room with more than three in. I’ve managed to break both rules, my book has quite a few and in one scene I have a meeting of eight heads of the different wizard orders all of whom speak. I know some books work with just a few but have read some excellent ones with a large cast, Game of Thrones being the obvious example, it has a bewildering array of characters, most of whom seam to die! Pearseus, Rise of the Prince by Nicholas C. Rossis is another good book that has a large cast but gets away with it.
Is there an accepted wisdom on this or is it just a case of if the books good enough you can get away with it?