I can't log in to Dire Maul for more than 24 hours

[Saneko-ragnaros (Saneko)]

Please do not create multiple threads about the same subject.

The new unique instance limit is explained at the WoW Classic Discussion which you can find here or the Russian version stickied here:

New Instance Limit in WoW Classic

As part of our ongoing efforts to eliminate exploitative and automated gameplay, with scheduled weekly maintenance in each region, we’re implementing the following change to our settings on all WoW Classic realms: You may now enter a maximum of 30 unique instances (dungeon and raid) per day, per realm. This restriction complements the current limit of 5 instances per hour. Now, when a player enters a dungeon or a raid, the game checks to see if they have entered 5 instances in the last hour o…