Experience w/ leaving REU program early?

I recently was accepted into my top REU, but the dates interfere with a really important vacation trip with my family. I was wondering if anyone in this subreddit has had an experience with leaving their REU program earlier than the end date, especially any AMGEN scholars, and if finishing your project ~ 2 weeks prior to the end date is possible? I'm not sure how flexible REU programs are with this. Thanks!