When you code for a long time nonstop, say 2hrs+, do you remember exactly what you did, other then it now works and meets all the requirements?

I do TDD, so tests first, then code, so the tests document new changes/features, and I commit frequently, using the angular commit guidelines, so at a later point, two monster energy drinks later, and all tripped up, i can still recall whats what

@nicholai not sure if it's the same but sometimes when I start a new project. I have the requirements and implement for several hours. When I'm done, everything works but I only recall what I did at a high level and that its done, everything works.

Generally, yes.
I spend a lot of time mapping and mathing on paper before I touch the IDE though. If I can't walk into an empty room and draw it out on a whiteboard, I have no business trying to make it into code. :-D