There is a structural problem with an MMORPG if you have nothing to do after 5 hours though.
Timegating only frustrates players and prevents them from being involved in the story. The War of the Thorns was the worst timegating ever, with 10-minute quests being stopped by one-week-waits every time. When you came back one week after, you had no clue what happened lately, you didn't even care anymore, and you pretty much knew you embarked on a 10-minute "journey" again.
Time gating was only invented to hide the lack of content at end game level. If there was some real content, you wouldn't be afraid of people grinding the shit out of your patch in 5 hours. As it would mean they'd just start the "end game gameplay" earlier.
But in today's WoW, allowing the players to finish the patch content in 5 hours mean they'll have NOTHING to do for the next 3-6 months.