I think you misundestand the purpose of your contract. Your contract is for you to produce value, not just to have your butt on a seat for 8 hours. The problem is that you cannot measure impact in a concrete enough way for a contract. So time is used as a proxy. If you cant deliver your impact in that time, you will get fired regardless. Just fullfilling the contract is NOT enough for the employer, so why take it literally yourself?