The planning phase takes place before the execution phase. In this phase the project timeline is set with the help of the gantt chart. Here all the timelines for the tasks are set taking into consideration most of the factors that would have affected the project timeline in any manner. Also any sort of pre-planned vacation of any of the team member must be discussed with the PM during the meeting held usually after the team selection so that workarounds are planned in advance such as hiring a temporary candidate to follow-up with the task. Apart from this depending on the length of the project three to five days of leaves should be should be accounted for during the planning phase if any sort of emergencies come up during the project.