In all versions of Project, in a task line, click a Duration cell to activate the spin button control and then click the arrows to increase or decrease the duration value in the cell. Each click changes the duration by one day. The Duration cell initially displays “1 day?” for a new task entry by default. The question mark sign (estimated duration label, “?”) in the cell disappears by the first click of any arrow.
Ismet Kocaman, MCTS, PMP, is a Mechanical Engineer based in Turkey. He has more than 15 years of project management experience in the manufacturing sector. He currently provides consultancy to small to mid-sized companies on project management, reorganizing, and streamlining the manufacturing operations. He also conducts training seminars for engineers on MS Project. Contact Ismet at firstname.lastname@example.org.