I've been meaning to revisit Star Wars The Old Republic to finish off the individual class story quests. Currently they have the 12x experience boost which means you can do all the story quests for each class from Level 1-55. This comes down to about 20 hours of gameplay per class and there are eight class story lines. I've done the Sith Inquisitor story line way back when the game first launched, I've got seven to go!
The patcher is really slow though... 25GB download and installation for the full client.