This is what the ancient world practised to ensure that they made the best use of their time. They didn’t have all of the electronic distractions that we do but they did have a lot more children so their issues were more immediate and pertinent. Such things as hunger, thirst and death from diseases which we have mainly stopped. So they had good reason to optimise the short lives that they had. It also means that if we follow their lead we will also benefit from there advice as it has passed the test of time.
See here Seneca for some golden rules to follow for time management.