My refill spreadsheet now predicts the delivery window within a day

Four columns since March: order day, ship day, delivery day, and price per mg after any coupon I can stack. Six refills in, the log finally says something useful. Order before 10am and it ships the same business day almost every time; order after noon and it slips to two. Delivery lands in 3–5 days, and the cold packs were still firm on arrival five out of six shipments. The one that ran long sat an extra day in a weather delay — ice was mostly water by the time it hit my porch, so I started noting arrival temps too. Price per mg has stayed flat within about 4% across all six, which I did not expect. Stock has shown available every time I've checked, but I check early. The variance is in their processing queue, not the carrier. Anyone else logging this stuff, or am I the only one with a tab literally named refill math?