Is there a standard length admission essays? I wrote about a page-page and a half, and the HTML box in my online application allows for maybe 3 times as much. I figure the admission people don't want to read a 4 page essay though, right?
First of all, don't write it in the HTML box. Write it in Word
If there is really no explicit limit (I would call and ask) than two pages double spaced is the reasonable limit. Which would mean 1 page in the FORM box (unless you found a way to double space it).
Again, it would much simplify your life if you write it in word and look for a way to "Attach" it.