# Days-to-Sell: The Number That Tells You What to Buy Next

Most resellers track profit. Fewer track time. And time is the number that actually tells you what to buy on Saturday.

Profit tells you whether a flip *was* good. Days-to-sell tells you whether to do it *again* — because a $40 profit that took eleven months is a worse business than a $12 profit that took four days, and the spreadsheet that only shows margin will never tell you that.

The math nobody runs

Take two items. Both cost you $5.

Item A: sells for $60 in 300 days. Net profit ~$40.
Item B: sells for $22 in 12 days. Net profit ~$12.

Item A looks like the obvious winner. But run it per day of shelf life: A returns about 13 cents a day. B returns about $1.00 a day. If your capital and your shelf space are finite — and they are — you can run the B play twenty-five times in the time the A play runs once.

That doesn't mean never buy the $60 item. Slow items with fat margins are a real strategy, and a healthy inventory holds some of both. It means you should know which one you're buying, on purpose, instead of discovering it a year later.

What days-to-sell actually tells you

Once you can see how long each sold item sat, patterns show up fast — and they're specific to *you*, in your market, with your photos and your pricing:

Category velocity. Modern game consoles move in days; niche collectibles move in seasons. Your own numbers beat anyone's general advice.
Price signal. If a category consistently sells in under a week, you're probably priced under the market. That's not a crisis — fast turns are worth something — but it's information.
The dead zone. Items past ~120 days rarely wake up on their own. They need a price change, better photos, or a different marketplace, not more patience.
Seasonality. The same item at 14 days in November and 90 days in March is a *stocking* lesson, not a pricing one.

Turning it into a sourcing rule

The practical version is a personal buy rule, and it's usually one sentence. Something like: *"I buy anything under $10 that my history says moves in under 30 days. Above $10, I want either sold comps under 45 days or a margin over $40."*

Write yours down. Check it against last quarter's actual sold history, not your memory — memory over-weights the one grail and forgets the forty singles that quietly paid the bills.

Then re-check it every quarter. Categories cool off. What turned in nine days last spring might be a sixty-day item now, and the only way you'll notice is by watching your own clock.

The habit

Once a month, sort your sold items by how long they took. Look at the slowest ten and the fastest ten. The slow ten teach you what to stop buying. The fast ten teach you what to go hunt more of on Saturday morning.

That's the whole exercise. Twenty minutes, once a month, and it changes what goes in the cart.

*FlipPress shows every sold item's price, the marketplaces it came down from, and how long it took to sell — on the web app and in your pocket. First 50 listings free at flip-press.com.*