If you make work a scarcer quantity, you’re more likely to use time wisely and get things done than if it feels like an endless to-do list.

And you cand do this by restricting your hours or restricting your workload.

• Tasks are discrete and fairly predictable.
• You might be tempted to fill up time without making real progress
• The tasks are frequently repeated, and therefore easier to estimate.

• It’s unclear the time and effort required to complete the task.
• The work itself is ambiguous and may require a lot of trial-and-error.
• The work is continuous and can’t be easily divided into discrete chunks.

The advantage of constraining tasks is that it focuses directly on the object of productivity: whatever you’re trying to accomplish: you can't fool yourself into believing you’re working hard but you’re not actually accomplishing much.

Disadvantage: tasks can often be ambiguo...

The biggest advantage of constraining time is that it’s always unambiguous. If you decide to work for three hours and then stop, there’s no confusion there.

Disadvantage: time constraints can encourage a sloppier attitude towards work. For example, you might decide to ...