Negative emotions like anger and sadness have a very short half-life and are impossible to sustain for hours or days if one is not ruminating about their causes.

“negative emotion in particular has a very short half-life you know many of us imagine that we can stay angry or sad for some people would imagine days I think almost everyone thinks hours at a time it's actually impossible if you are no longer lost and thought about all the reasons why you should be angry or sad”