Forward pass:
E1 = 0
E2 = 0 + 7 = 7
E3 = 7 + 14 = 21
E4 = 7 + 5 = 12
E5 = (21 + 11) (or) (2 + 7) = 32 [whichever is maximum]
E6 = 0 + 6 = 6
E7 = 6 + 11 = 17
E8 = 32 + 4 = 36
Backward pass:
L8 = 36
L7 = 36 – 18 = 18
L6 = 18 – 11 = 7
L5 = 35 – 4 = 31
L4 = 32 – 7 = 25
L3 = 32 – 11 = 21
L2 = (21 – 14) (or) (25 – 5) [whichever is minimum]
L2 = 7
L1 = 7 – 7 = 0
EFT and LFT are same is 1-2, 2-3, 3-5, 5-8.
Hence the critical path is 1-2-3-5-8 and the time to complete is 36 days.