It starts innocently enough.
Sprint four. Someone from finance asks how many days a five-point story takes. Your Scrum Master gives a number, meaning well. By sprint six, that number is in a spreadsheet. By sprint eight, the spreadsheet is attached to a quarterly delivery forecast.
Congratulations. You are now doing waterfall with extra steps and a daily standup.
Story points were designed for relative sizing, not calendar math. The question they answer well is: is this story more or less complex than the login feature we shipped last quarter? That comparison is genuinely useful for planning, because the team doing the work has the clearest view of relative complexity.
The question they were never designed to answer is: how many hours will this take? The moment that conversion gets made, you have surrendered the one useful property of the tool.
What follows is predictable. Management tracks velocity as a productivity metric. Teams inflate estimates to protect capacity. Stakeholders stop trusting the numbers because the numbers stop meaning anything. Sprint planning becomes a negotiation where the goal is landing on a figure that satisfies everyone in the room rather than one that reflects reality.
Two things help consistently.
Keep a reference story — a well-understood, medium-complexity feature the whole team agrees on — and size everything relative to it. “More or less complex than the payment flow from last quarter?” is a more honest question than any planning poker card.
When someone asks for the days conversion, surface the actual question underneath it: “Roughly two to four days depending on what we find. What planning decision are you trying to make?” That usually gets to the real need — release timing, resource planning, dependency coordination — without permanently converting your sizing tool into a fake timesheet.
Story points can survive management attention.
They rarely survive a spreadsheet.
The estimation chapter of Surviving Agilefall covers the two-track strategy in detail. Also available DRM-free on Gumroad.