hi
the length of the personal statement does not matter-given that you are thorough and convey your ideas well. at the same time, you don't want it to be one or two paragraphs either. but 800-900 words is fine. i'm passing on a helpful tip..... once you think you've completed your statement. put it aside for a few days and then look at to see if it says what you are trying to convey....do have at least a few ppl look at it.