Because you will be caught in a lie upon a records check and that will be an instant rejection plus a 'no-reapply' status on your file.
Don't you think I hadn't thought of that ?
Remember that you fill in your times with every medical application.
With my current employer I was halfway through training when I got an email from the third party security consultancy requesting additional info on an employer that I listed on my resume.
Guess what would have happened if I'd lied?