I've spent about five minutes each of the last few days trying to guess the password to my old university e-mail account. It was the same for about six years, then a security measure was installed where you had to change it every two months. I lost track of it shortly after that. My old university lets you guess all day, but I get sick of it pretty quick since there are no consequences. At my old job, our online meeting system only gave you three chances to sign-in, and if you got them all incorrect, it locked you out of the system for an hour. You could tell people were sweating their online presentations when they signed in more than an hour in advance just in case they messed up their password three times in a row.