Your experienced UI designer estimated the "Design User Interface" activity at 80 work-hours based on her normal productivity of 8 productive hours per day. She will be unavailable for the first 5 working days, when a less-experienced designer, whose productivity you estimate at 6 productive hours per day, will cover the work. Afterward the senior designer returns. Assuming no other resources are assigned, what is the revised duration estimate in working days (round to the nearest whole day)?
Junior designer works the first 5 days at 6 h/day → 30 h completed.
Remaining effort = 80 h - 30 h = 50 h.
Senior designer's rate = 8 h/day → 50 h ÷ 8 h/day ≈ 6.25 days, rounded to 7 working days.
Total duration = 5 days (junior) + 7 days (senior) = 12 working days. Keeping the original 10-day estimate ignores lower productivity; higher durations such as 13 or 15 add unnecessary padding beyond the calculated need.
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