Are you asking someone specifically on SDN if they'd read over your application essay in a time crunch, or are you legitimately wondering if you can be directed to a link? If this for pharmacy or med school?
If it's either one, I'm honestly not sure what can get done in a couple hours if it's a goal-oriented, thought-out application preface with constructive feedback needed from adcoms or the like. Hopefully that link steers you in the right direction.
If you are at a university, you should hopefully have access to a writing center tutor. I doubt you'll be able to get that done in a "few hours" though.