My “10-minute rule” is pretty straightforward: Every task on your to-do list should take no more than 10 minutes to complete. If it takes longer than 10 minutes, then you should have broken it down into smaller tasks or delegated it to someone else. The key to this rule is in enforcing it, which means setting the timer on your phone to go off at the 10-minute mark. The level of speed and focus that this brings to your day is nothing short of astounding.