Most of my projects are lengthy, few shorter than a year, most two to three years, one going on thirty five years. Logistically I know in advance what dates I need to cover, typically ten to fifteen days per project, per annum. That requires regular processing, scanning, contact prints and logging, I try not to leave films more than two weeks between shooting and processing. We all have our inner Winogrand (logistically if not creatively) with unedited films piling up in the background, plus my memory is like a sieve if shots aren't tagged and dated.
Fine prints are much less frequent but I figure if I stepped under a bus tomorrow, the negatives are well enough ordered for someone to pick up the pieces. Or throw them all in a skip.