I get paid for about 20 hours a week, because thats all our grant could allow, but I do more like 30-40 hours a week, but the bigger thing in my opinion is the wierd hours you have to come in. I find myself many nights sleeping in the lab so I can run experiments over night. It isn't a constant thing, but I don't know how many times I have been sitting down to eat dinner and my advisor calls to have me come in to look at some gels or to talk about things we are going to be doing. I have found that everything takes about 3 times as long as you think it should and at times can seem stupid. I think research hours are more about when the hours are, not how many hours. Most of the time when an experiment is going anyways, I am just sitting around or studying. Who knows maybe it is just me. My research is with a specific protein, and the majority of my time is spent harvesting the protein from cells, which is a start and stop process. Just my thoughts.