So to bring up valid reasons why the timer is 30 minutes and not longer, there isn't a crap ton of realms yet because there isn't a need for them. Unlike World of Warcraft, you can AFK for about 6 hours before being kicked to the login screen, but Blizzard also has 241 realms in North America and 263 in Europe, this is why they can allow such large AFK timers, they have more realms for their 6-7 million players to access, with about 3-5 of them on NA that ever reach player cap and having a login queue, and about 5-8 in EU, most of the others are semi populated to some that a really barren, but not much they can do about that since they wont merge realms or offer players on the barren worlds free transfers off to the medium populated servers so they can shut down worlds, but most of the realms are like this because they've lost 5+ million players since Wrath of the Lich King.