How long will it take to complete any task? It depends on two things—the task and the individual's prior experience with similar tasks.
Estimation may appear to be a very dry subject and overkill for trivial tasks. However, it is a very important step in managing expectations and creating realistic daily task lists.
An estimate is only a guess. Sometimes, it is an educated guess; sometimes, it is a calculated guess. In either case, it is still a guess. It becomes useful and effective when it is backed by plausible basis and reflects reality.
Any estimate could well be a number taken from thin air unless it is close to the actual time. An estimate can only be validated after the task is completed. A good estimate is within an acceptable ...