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Estimating time is no trivial task. From my past experience I can say that it really differs from person to person from team to team. In fact in the past we have wasted so many hours estimating work load, time that could have been better spent on the actual tasks. It took quite some effort to get into a Kanban style process. Not for developers but for business and product managers as their central question 'when?' is meassured differently now. We got away from developers guessing how long it will take and instead take the past performance to guess future timelines. Works better for us. The whole point is: Take burden off your developer, improve your processes around him. Provide better requirements, give valuable feedback, understand issues and risks. The more input from your side, the better the 'estimations' from your developer.