You should all know the ropes, but in case you don't, here's a nice guide for maxing your karma.
First things first: Yes, it takes a lot of time to get the max
negative karma, if I'm right, it takes about an hour and a half, depending on your processor speed(browser refreshing time) and internet connection(connecting to the server).
1. Find the justice button. Press it(preferably on one of your own posts)
2. Hold F5 for a long time. Your karma should rapidly decrease.
3. Wait. Alternatively, you could construct something that makes the F5 button held down(some keyboards are worse to do this on than others!)
Some may ask themselves(or me) if this is needed. Maybe not, but here you go.
--------------------aran - Graces of Heaven