Estimations are not meant to be used as accountability rulers. They are meant for visibility.
it gives early visibility to know that our business schedules will work, or early warning they will not so we can react accordingly.
….the much you break tasks into smaller pieces the easier to estimate
….estimations, by definition are “best guesses based on current information”
if a task is going to take 2 days to complete, it will take 2 days, no matter what is your estimate.
breaking your work to smaller tasks, considering unknowns makes an estimate close to what a task will take to complete.