It greatly depends on the industry, the specific company, and the specific language of your employment contract. As an engineer I've never worked at any company

It greatly depends on the industry, the specific company, and the specific language of your employment contract. As an engineer I've never worked at any company that required a strict daily schedule and if any of my employers had tried to hold me to one I would have either quit on the spot or let them fire me, depending on my mood. A lot of my colleagues have been perfectly fine with a regular 9-5 schedule though; I value flexibility, but it's not everyone's first priority.