Depends. The kind of exercise you're thinking can be done vigorously and for a long period -- or, for some people, it could be a quick 5-10 minute thing that feels vigorous but really doesn't involve that much muscular effort.

It's common to have a 1 hour running or a lifting session 3-4 times a week but kudos to you and/or my condolences to your partner if your vigorous exercise lasts that long every time.