Please note that critical path(minimum total duration) is Activity 1-- Activity 3-- Activity 4
Activity 1 will take 10 days to complete
Activity 3 will be finished on 8 day after start of Activity 2. It has F to F relationship with lead of 2 days,so it can start anytime but can only finish on 10-2 i.e 8th day.
So as of now,we have duration of CP =28
Activity 4 will be finished on 37th day. 6 days + lag of 3 days =9
Sp CP duration= 28+9 = 37
Hope it clarifies.
Check the formulas for free float and total float and relate it to days.
Total float= Late Start date – Early Start date or Late Finish date – Early Finish date
If you choose to start your project from day 1
Free Float= ES of next Activity – EF of current Activity - 1( Free FLoat=9 , 22,23,24,25,26,27,28,29,30)
Moderators: Yolanda Mabutas, Ahmed Amin, Scott Gillard, Michael DeCicco, Rahul Kakkar, Fernando Jr Sinlao Lim, Mary Kathrine Padua, Chris Preziotti, Lazard Toe, ITBMC, MPM, CIPM, PMP, ITIL, Christian Winter, Kevin Nason, Michael Sumaquial, PMP, Steven Mudrinich, PMP, Mark Wuenscher, PMP