How long have the woman been working in the lab?

M: How long have you been working in the laboratory?
    W: For almost three years, ever since I got my degree.
    M: Your bachelor’ s?
    W: No, my master’s. I didn’t try to get a job until I had my master’s degree.
    M: What kind of research do you do? Are you trying to develop new products or something like that?
    W: No, that’s done by another group in the lab. The group I’m with is doing basic research.