The 30 minutes timelapse for that bit of work with the redo.

1.5 hours of making a performant notes/todo app.
How long it took me to implement undo and then refactor to prepare for redo, and remove some arbitrary code barriers.

Basic undo implemented, every time the text is edited it takes a snapshot of the pieces, and the current snapshot is kept track of.
Next is redo, and deleting undo history when we start typing again.

1 hour timelapes of working on that memory stuff (already at 57 hours btw)