You can, but you don't need to enter hours before; everyone who's queuing on the ticket page the moment the on sale starts, will be automatically assigned a random spot in the queue. For this, it does not matter whether you've been in the queue for one minute or one hour. Opening the queue page too early might result in a broken connection between your browser and the server, which means no queue number can be provided. If you arrive on the ticket page really early, you can avoid this by refreshing the page a few minutes before on sale time.
All visitors that enter the ticket page after the on sale started, will be assigned a spot at the back of the queue.