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The graphic shows an example of Lead Time.
It shows two consecutive activities represented by boxes. The first one on the left is for Mix Concrete with a duration of 6 units and the one on the right is for Pour Concrete with a duration of 4 units.
There is a lead time of -2 units between both activities shown by a number on top of the arrow that points from the activity on the left to the one on the right.
There are some calculations for the Timeline Forward Pass that show how the values are calculated.
The calculations are: 1(ES1) +6 =7(EF1) -2 (lead time) =5(ES2) +4 =9(EF2)
There are other calculations for the Timeline Backward Pass that show how the values are calculated.
From right to left, the calculations are:
10(LF2) -4 =6(LS2) +2 (lead time) =8(LF1) -6 =2(LS1)