I think it’s a purposeful abstraction for relative estimation of a task. Since nobody is good at estimating the exact number of days a particular task will tak

I think it’s a purposeful abstraction for relative estimation of a task. Since nobody is good at estimating the exact number of days a particular task will take, story points are a way to give a general estimate of task complexity (usually people end up equating this to a rough timeframe) without having to commit to a specific number of days. In our 2 week sprints we have four possible story point values - 3, 5, 8, 13. If the story should take a couple of days, it’s 3 points. If the story will probably take the full sprint, it’s 13 points. If the story is somewhere in between, pick 5 or 8.