Happened to me this week. "Luckily", they also implemented the "feature" where they can send you your password by email directly after you set it, so when I couldn't get in with the password I set, I reset the password, got a mail with a new password, logged in, changed the password to a new random long string, and this timeasked them to send the password to me. The password they sent was chopped off. That told me their limit, so I could set my password a third time to get something maximally secure.