What to do if you completed the task ahead of schedule?

Question

Work organization

I noticed that the faster you complete the task (before the deadline), the more tasks they begin to expect from you (the amount of work from this only increases).
And vice versa, if you completed the task ahead of schedule, but at the same time you sit and study the project (save your energy), and if you delay the deadlines, you can "tighten up" and "release" the task faster - everyone is happy.
- Is it worth releasing it ahead of time?
- And what's the best way to do it?

Answer 1

Keep a balance on the side of saving energy.