Yeah, my SAC was 12 pages double spaced, and my 40 minute commentary was 4 pages without double spacing. I think there would've been about 150 words per page for the SAC itself (I'm not too good at estimating though; I could be quite off) and around 300 per page for the commentary. I still think it's better to be efficient with words rather than rambling on though - a 900 word essay might be better than a 1500 word one. I guess I wrote so much for my English SAC because I wanted to include a number of different scenes but explore them properly. I do write really, really quickly though - I did around 70 pages in a 5 hour physics exam the other week. The main thing is just to have an idea of what you're doing and let your ideas flow - you can always edit them later.