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The graphic shows an example of Lag 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 lag time of 5 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) +5 (lag time) =12(ES2) +4 =16(EF2)
Other calculations for the Timeline Backward Pass that show how the values are calculated.
From left to right, the calculations are:
18(LF2) -4 =14(LS2) -5 (lag time) =9(LF1) -6 =3(LS1)