When I think about this question, my feelings of my overall life tell me that I've never experienced any moment of happiness. Not genuine happiness anyway. Realistically, that might be wrong and I can say if I think deeply about it there are a few moments I can refer to - being with a good friend and having a moment watching a comedy movie in a theater where an extremely funny moment comes up and laughing so much it hurts. I can think of about 4 or 5 of those moments in my whole life, a grand total of 20 minutes altogether.
Getting hired after interviews. Since I stay at jobs a long time, another 4 or 5 moments, 10 minutes.
Lastly there are moments of talking to people I like where there is no time pressure or other responsibility, just talking enthusiastically, nothing stressful, conversations that contain some measure of hope in life. Altogether it can't be more than a total of a few hours of moments within that of happiness.
A few moments of accomplishment, creating and finishing something, by myself or with others. Those moments accumulate to about 5-6 hours total altogether.
I believe I have felt happy in life no more than 12 hours of my existence. I hope when I am on my deathbed and any part of my life flashes before me, those are the only memories I get presented with. But I think not, I think I will just experience more misery like "oh god, I think I'm having a heart attack, but there is nobody around and I'm going to die alone" and then nobody finds me until a few days later when the neighbors call police from the smell of my rotting corpse.