Lots of folks work well over 40 hours a week (also kind of a pro; your coworkers will push you to be better and believe in the company's vision). Although honestly most people generally drew the line in the 50-60 hours a week range which still allows you to have a life outside of work.
Things can feel disorganized at times with priorities shifting radically week to week. Again, I think this is quite common with tech startups