The Critical Distance.
Critical Distance you say.....???
It's a term used to describe the need for time away from an artwork so that you can see it with fresh eyes, objectively and with a view to correcting and completing the work - basically, the opportunity to critique your own work.
The more time an artist can give an artwork, the greater the opportunity to clarify the vision - and then it's a balance between not working enough and over-working the piece.
Right now, I can look at each drawing and see where it needs further work, and where I have to stop and let the poor thing breathe life. Sometimes the desire to 'mother' a composition can smother it instead!