Not exactly, no. But how far can you stretch that? Working 4 hours a day is half of what is agreed in the contract. Would you be fine with the employer ignoring the agreed salary with the excuse of no one following contracts exactly?
What do you mean? As far as I know, I've always worked according to the contract.
Some of my employers had flexible timekeeping, and then I would often work a bit over 40h/week so that I could take extra days off for extended weekend trips when I felt like it.
You've always done things like observed the precise lunch hours (and not taken a single minute more)? This stuff is usually defined in contracts but at least for a professional job in a good workplace is subservient simply to getting the work done rather than literally doing your 7.3 hours of work and 0.7 hours of lunch to the letter. Even doing duties for your job that aren't listed as part of your contract is common. How common is working more than the contract specifies by just a few minutes? And so on. There's a reason Work to Rule strikes [1] are a thing.
