Cat pregnancy, how long is it?

How long is the average cats pregnancy? And how can I tell just how long it will be til my cat has her kittens?

Ok, well first of all, I'd suggest getting her spayed. Cats mate every 3 months so expect a lot of kittens in the near future. This means you'll have to be finding a LOT of homes for them or face taking them to the crowded animal shelters, where many cats are put to sleep.

I'd read this thread, where I gave lots of information.

http://www.funadvice.com/q/cat_pregnacy

All the cats I've had in the past call one of the family member out to help it give birth like watch out for it. I think its usually 2 months pregnant