There are two limitations
Rate limit on registrations per IP is now 10 per 3 hours.
Rate limit on certificates per Domain is now 5 per 7 days.
(taken from https://community.letsencrypt.org/t/beta-program-announcements/1631)
That means it will be okay in a few months - actually it will be ok in 7 days. Since the per Domain limit is 5 certs per week, if you have more than 5 requests for a domain you shouldn’t leave all renewals for the last week.