Painting

I have been on a painting kick lately. First I painted my room and then I painted my girlfriend's kitchen. I might also paint the bathroom. I found that the painting itself doesn't take as much time as the preparation for painting. You have to move everything out of the way, fill the holes, sand the fillings wash the wall and tape the edges and only then you can start painting. And when it's all done then there is a clean up phase. I have to check the price of the rolers next time I am in the paint store, as those are the hardest to clean. What I mean is that no matter how much water you run through it it always have some paint left in it. And this could interfere with the next painting job. I found the easiest way to clean up is to dispose of the roller :). Anyways, if somebody out there knows how many times you should reuse the roller or how can you tell when the roller is not good anymore please let me know.