Accurate time estimation is essential for a good project management. Sometimes project manager fails to estimate correct time due to unexpected events or unscheduled high priority works or may be unfamiliar with the type of task . For estimating correct time project manager should identify all the work need to be done within a project and how much time should allow for meetings, reporting, testing and other activities needed for project’s success. Project should be break up into number of task and prioritize tasks and activities and evaluate the time estimate for a task and then sum up time estimate for whole project. Identify the correct order in which things are meant to be happen . Project manager should use the prior experience of team member for a similar tasks . Team members sometimes are more optimistic can under or over estimate the amount of time have a bad effect on overall project time estimation. Project manager should consider the factors like emergencies and accidents, missed delivery by suppliers, breakdown in equipment, people who are working part time, holidays and sickness. If team member finishes process early then time can be spent on important things like missed milestones and mistakes .Team have more time to manage the unexpected risks and improve quality.