It might seem kind of odd, but part of my problem with playing Final Fantasy XI back in the day was just about the time spent grinding in any given zone. Now, I’ve mentioned before how a bit of grind can be a good thing in its own right, but the thing is that speaking personally I start to get pretty bored after a couple of hours. That was a real problem in a game where grinding could easily mean spending many, many more hours sitting in one place and grinding away at a leveling camp.
Some people are not like this. If you tell them that the fastest way to do something is to run 50 dungeons at 10 minutes each, well, the next eight hours just got filled in without a slight complaint. Other people are not like this in the other direction, and even half an hour of doing the same thing is going to get old. So how long can you grind on content in an MMO? Do you have a higher or lower tolerance for it?