soo, i rarely do 5 mans for transmog whatever, but i got an urge to earlier. i've known about the "you have entered too many instances recently" thing for years, but i have always thought it was 5 per hour and then it resets.
i finished 5 instances and waited a few minutes because i was just a few minutes away from an hour from when i had started my first run. after a few minutes, it let me do a 6th run. after i finished my 6th run, it gave me the message once again and im not sure why... could someone clarify the exact rules? i guess there is more to it than just 5/hour and reset? :/