If you work 8 hours a day and you are able to finish your tasks in lets say half the time (by pressuring yourself, working harder, smarter and being super efficient). Is it ethical to use the time left for yourself?
If it's not ethical => Naturally you will finish the tasks in the 8 hours that you have ... you won't pressure yourself.
And even If it's ethical => You will end up with more tasks from your boss anyways.
What do you think?