For salaried staff (accountants, engineers, human resources, etc.), core hours are 8am to 4pm. Most people work either 7:30am to 4pm with a 30 min lunch, or 8am to 4:30pm with a 30 min lunch
Most notable thing is that men must be clean shaven if they work in engineering, maintenance or operations. In Engineering specifically, jeans and tee shirts are not uncommon, though jeans or chinos with collared shirts are more common. I've only seen dress pants worn regularly by general managers and higher
There are lots of deadlines to meet especially in finance that results in a high tempo work environment. Luckily during my time there, the team culture in Finance helped with pressure and made it a great place to work.