# Question- total duration b/w activities

 31. Found this question on Oliver. Can someone pls explain. Activity 1 has a duration of 20 days, Activity 2 of 10 days, Activity 3 of 5 days and Activity 4 of 6 days. What is the minimum total duration between the Milestones A and B? 36 days 37 days 39 days 42 days

### Need to pay attention to FF-2 & FS+3 for activities 3 & 4

 Activity Dependency Act Dur Calendar days Assuming Act1 start day as 1st #Days in to the calendar Acitvity 1 Act 1 can be started after reaching Mile stone A (FS) 20 d 1st to 20th 20 Acitvity 2 Act 2 can be started after Act1 is finished (FS) 10 d 21st to 30th 10 Acitvity 3 Act 3 can be finished 2 days before Act2  is finished (FF -2days) 5 d Any 5 days between 21st & 28th 0 Acitvity 4 Act 4 can be started 3 days after Act3 is finished (FS+3) 6 d 29th to 31th idle days. Activity4 will be from 32nd to 37th 7 (-2+3+6) Total 37 days

Note:    Activity 3 is done in parallel with Activity 2 & getting finished before activity 2

Vijay Bheemineni, MS, PMP, ITIL.

### Thanks again Vijay..

Thanks again Vijay..

### Hello, Why do we need to

Hello,

Why do we need to take  [-2] in account while calculating duration of activity 4? Activity 3 can be finished together with activity 2 and has 0 duration. Then all we have is FF+3 which will result in [6+3 =9] for activity 4

Activity A

<----------------------------------->

0                                              19                    = 20 days

Activity B

<----------------------------------->

20                                           29                   =  10 days

Activity C

<----------------------------------->

25                                          29                     = 0 days

Activity 4  [ 30,31,31 for lag time of 3]

<------------------------------------->                   = 3 days of leg + 6 days = 9 days

33                                            38

so total should be 39?

Can someone help here?

### Recheck

You have missed FF -2 for activity 3

### Why should I take FF-2 for

Why should I take FF-2 for Activity 3 into account when it is done in parallel with Activity 2?

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