I would be hesitant to characterize this as a cultural difference in therapists, just because you only have one data point. It is possible that she has small children at home, a chronic illness, different financial goals, or some other perfectly acceptable reason for working the hours that she does.

That said, it's also perfectly acceptable to talk about your concerns and/or find a new therapist if you aren't meshing with this one. Being told to stop thinking or worrying about something would irritate me endlessly. I also think it's reasonable to find a therapist who has a different philosophy about hard work and/or tackling challenges.