A codebase that is not actively maintained is rotting in real time, even when nothing visible is happening. Background tasks accumulate. Dependencies fall behind. CVEs go unpatched. The Friday afternoon pass is our weekly answer.
Every Friday at 13:00 the entire collective stops feature work. Each engineer takes one repository — usually their current sprint's — and does the same three things, in this order. Update every dependency that can be updated. Delete any unused files, exports, or modules they can find with a static analyser. Write a one-paragraph note for anything they want to remove next month.
The benefits compound. An hour every Friday for a year is fifty hours of maintenance per repository — far more than we would do in a single quarterly push, and spread across the year so nothing ever falls more than a week behind.
The cost is sub-one-percent of our time. We bill it as part of every retainer; clients have never questioned it twice. The bug rate stays low. The morale stays high. Friday afternoon ends in a kettle and a beer.