Make friends with the HS track coach (men's or women's). Ask if you can run for him/her and get a time, and more importantly, some pointers. Tweaking some key elements (body position during the start, arm movement, finish) can reduce your time very quickly. It won't be an official "baseball time" but it sure beats doing it yourself and the coach will know when to start and stop the clock.
There may be a running professional around your area that can do this for a fee. My son had several sessions with a fellow that did wonders.
Page to the 55 second mark on the clip below. That is what what one my son's travel teammates told him he looked like running: