Like any startup, you're expected to (or just have to) work fairly long hours to get your job done. It honestly doesn't seem like you're working that long because it's fun, interesting work, but for some people with families it does require more time, then, say working a 9-5 job that you can be done with when you go home for the day. If you want an extremely structured (ie "big company") environment, then this is probably not a place you would want to work. However, it's actually fairly structured for a startup environment, with more processes and procedures being put in place as the company grows.