Yogi: It took 4 days for the mind to calm down (not be angry) over an incident.
Sayadaw: Your emotion is your business. You should continue to be with the anger and learn from it. This is very good because it is a real experience.
Whatever the experience, your anger is the problem. It is more meaningful for you to try and watch the anger. Ask: Why is the mind angry? Later, you can explore: Is it necessary or not, beneficial or not?
For me, whenever I notice my weakness – something that triggers and causes the mind to be angry – I will revisit the same situation again and again to learn something about the anger.