You are managing a software development project that involves creating a new application. Your team has identified an activity 'Design User Interface' that typically takes 10 days. However, you've recently learned that one of your most experienced designers will be unavailable for the first 5 days. How should this impact your estimation for 'Design User Interface' duration if your team will have a new, less experienced designer during those 5 days?
Keep the duration estimate at 10 days since the team has already performed similar tasks within this timeframe.
Increase the duration estimate to 15 days to account for the reduced productivity of the less experienced designer.
Reset the duration estimate to 5 days based on the availability of the less experienced designer.
Decrease the duration estimate to 7 days as an average between the experienced and less experienced designers.