Hi Minx,
It sounds like your heart is already sending off some important alarm bells (or as Martha Beck would say -- your essential self!).
I have worked in an industry that expected incredible time commitments from its employees. I remember times when I'd be at the elevator at 6 or 6:30 to leave -- and I'd feel like I'm leaving early!! It's a pretty sick way to run a company, not to mention a life.
I got out of that intensity almost 2 years ago. Unfortunately, it was out of the fying pan into the fire, trading one set of problems for a whole other set. But that's another story.
All this is to say that I completely understand why you're second-guessing this position. The goal of our changing career path is to increase not only the satisfaction from the nature of our work, but the work-life balance too.
Waiting and reviewing all the options on the table now is perfect. And here's some words I should be heeding myself -- don't feel you need to panic and take any of them if none feel right.
good luck!
gf