Assuming that you had only one crane capable of 30 lifts per day, 3 column...

 Calculation of Total Lifts Required:

3 column pours = 28×3=8428 \times 3 = 8428×3=84.

Additional lifts = 150150150.

Total lifts = 84+150=23484 + 150 = 23484+150=234.

 Lifts Per Day with One Crane:

1 crane performs 30 lifts per day.

 Required Duration:

Minimum planned working duration = ⌈234÷30⌉=18\lceil 234 \div 30 \rceil = 18⌈234÷30⌉=18.

 Verification with PSP Guidelines:Aligning workload with equipment capacity ensures practical schedule planning (Ref: PSP Study Guide, Chapter 2B: Workload Balancing).