Sounds like the OP was referring to guildhests specifically. If so then the reason that was taking so long is cause its only really worth it to do them once per character. That is the only time you get a good chunk of rewards, even if you switch classes you will never get that good chunk again. Unless SE makes some changes to the way that works i fear the guildhests will be something that dies off really fast. I tried to catch up since I hadnt done one in just about 20 levels and couldnt get one either, I was a tank even.

Try queueing up for dungeons instead, you might have to wait till you find a group of friends willing to run you through guildhests before you can start doing more of those.