The next useful test is to group by neighbourhood, warehouse configuration and occupancy, then compare three timings: first appearance, first reduction and completion or withdrawal. If reductions cluster early, pricing expectations may be the issue; if stock sits unchanged and later disappears...
I wouldn’t discard the 43-day figure completely. Used consistently, it can still show whether fresh supply is being absorbed or accumulating. Pair it with weekly new-listing volume and the number withdrawn, rather than treating days on market as a standalone measure.
Also separate warehouses...