Roughly a single page single spaced I believe was the most common? I kept mine to roughly that based on opinions of others. The directions on that are ambiguous due to the mention of "scrolling" however that seems to change depending on screen size and browser adjustments.
Also in regards to the Q on the personal statement, it requests it in the first part of submitting to get the ball rolling. So you (unless told otherwise) need to do it once the application appears in your portal (after you submit the inquiry). After you submit it, you then get the folder items in.
Before I saw this thread mention the program being merged, I applied to both the post-bacc and the master's (and the master's in Bradenton). Fairly trivia in the greater picture, but if the programs are being merged, why are we still allowed to pay and submit an app for the post-bacc? I find that odd as it makes more juggling of submission of letters and other required materials, and one could essentially double apply as I did.