I am quick to forgive a lot of things, especially little things and especially if the person apologises or clearly wants to move on from it. I am generally not good at staying angry. I just can't muster the emotions for that long. XD If someone is nice to me somehow I will probably forgive them pretty quick haha. I guess its the same as what Speed was describing.

But I have held grudges for years before. It's a lot easier to hold grudges if you don't see/talk to that person again, I recon. Cos then the person never has a chance to redeem themselves so you probably just assume they don't car/are still a jerk about what happened when it may not be true.