Originally Posted by
Ratyrel
No, unfortunately you can't.
Dungeons do not take significant amounts of time, say half an hour to 45 minutes at the beginning of an expansion, 10 minutes at the end. LFR raids vary a lot, depending on whether you have a good group and smooth sailing or undergeared players/leavers. They will take between 35-45 minutes and forever. Remember that World of Warcraft contains an incredible amount of content, however, if you are starting fresh. Even without endgame you won't run out of things to pursue for a long while.