I think it is a great idea, but doesn't apply to 99% of my notebooks because they need to run up to 2 hours to completely execute once, due to data intensive ta

I think it is a great idea, but doesn't apply to 99% of my notebooks because they need to run up to 2 hours to completely execute once, due to data intensive tasks. I usually run all cells once per day, up to cell x (where I left the day before), then continue working by adding cells and updating the state manually until I make progress (=no errors or output is as expected) and move on to the next cell - without re-executing other cells because this would be a productivity nightmare.