The 'World of Warcraft Classic' demo has launched - but there is a cooldown.

World of Warcraft

World of Warcraft

Blizzard has revealed the demo - available to BlizzCon virtual ticket owners - has both a playtime time limit and cooldown which starts when you first log into the game.

According to the company's post on Battle.net, this is "to help as many people as possible play the Classic demo as much as possible".

It added: "Our goal is to lift session limits as quickly as we feasibly can after the demo goes live. We will then only reinstate session limits if unexpectedly high demand returns."

The limit will be set at 60 minutes with an overall cooldown of 90, meaning a gamer will have to wait half an hour before playing again if you play for an hour.

Blizzard has explained it further and given some examples of how you can play.

It continued: "If you play for 30 minutes and then log off for 60 minutes, when you come back you'll have a fresh 60 minutes.

"If you play for 60 minutes, you'll be disconnected and then have to wait 30 minutes before you can play again.

"If you play for 20 minutes, log off for 20 minutes, then play 40 more minutes, you'll be logged off and wait 10 more minutes."