It is LESS THAN 2 weeks, nice schools give you TEN days to decide, during which you show up on AMCAS as having 2 schools and less of your other waitlists will want you then, so it's best to decide fast (call them) or other schools won't touch you with 2 schools after May 15th.
(Some schools give you only 5 days and another one gives you 48 hours, harsh...so make sure by holding 2 after May 15th, you are not scaring off the school you love and are waitlisted at...they will be less likely to offer you a spot with already 2 schools after May 15th, Good luck.
P.S. I love May 15th, Matrix and Waitlists start to get ready to move...😍