I'm certain it's 4500 characters to include spaces between words, punctuation, and hard returns. I've written several as I'm a reapplicant and I just character counted on my copy of them. This is approx 1.25 pages, 12 pt times new roman w/ 1.25 inch margins on all four sides. Alternatively, you can use the character/word count feature on your word processing software. AADSAS will not accept it if its long, so I suggest you shoot for 4490 characters max just to allow for differences unique to AADSAS.