Project control is an essential task for a project manager. Project control is carried out by comparing the actual project performance in terms of time and cost with the project implementation plan. A typical project control method is the Earned Value Method (EVM). Previous research, overemphasis on EVM and using cost component for schedule performance, could provide misleading information in assessing the schedule. Based on data from one of the largest telecommunication providers in Indonesia, many projects suffer a late completion and have proposed a time extension. The penalty for the project’s late completion is a percentage of the project’s amount. So in this research, three projects with the most significant amount from a telco company as one of the company’s clients are selected. The result of this analysis is a preventive and corrective action to control the project duration.