If a dog insults you and you feel upset for a whole day, it's as if it insulted you all day long.

If you remember it for a year, it's as if it insulted you for a year.

If you can never forget it for the rest of your life and get angry every time you think of it, it's as if it insulted you for your entire life.

So instead of draining yourself over a long period, it's better to just settle it once and for all at the time.