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The graphic shows an example of Total Float.
It shows two consecutive activities represented by boxes. The first one on the left is A with a duration of 5 units and the one on the right is B with a duration of 7 units.
Activity A has ES=3 EF=8 LS=6 LF=11 and activity B has ES=8 EF=15 LS=11 LF=18.
Total Float for A is: 6-3 or 11-8 = 3
Total Float for B is: 11-8 or 18-15 = 3