Try LFG/area channel. i'm an archer... i waited less than 5minutes when i built my own group.
im assuming the OP is of high lvl....prolly lvl 50+
and im assuming the replies that said area chat is the solution are low lvls.
being a lvl 60, yes i had no problems finding a group when i was low lvl, but as soon as i hit lvl 40, which was far faster than most of the other players in game, looking for a group took me 3 hrs, then i gave up, turned off the game, took a nap, came bak, and took another 4 hrs. this was all done in area chat.
even after being lvl 60 for a week, finding an instance through area chat is pretty much impossible. unlike other games where u have a place for all high lvls to hang out, TERA does not have that yet. people are still lvling and most lvl 60s are just using the dungeon finder.
and yes, the dungeon finder will ALWAYS say estimated time is about 12 mins. it doesnt matter if ur a dps, a healer or a tank, it will ALWAYS say 12 mins (or something close to that). it can sometimes take me up to an hr just queuing for a lvl 60 dungeon.
this is pretty normal though. but if continues to happen even after a month....2 months or even 6 months, its pretty much an indication that no one wants to play this game anymore.