40 secs is fine, maybe even less. I meant to say it really shouldn't be any longer than at most 60 seconds since that could cause unknowing people to browse away before the magic happens.

As for sound, I figure one could try to find some track that starts slow and bursts into awesomeness after roughly 40 seconds.

As for the opening, that's a difficult one. But also very important. Please someone, help us out here.