I was on a nuclear ship that was being refueled in 1974. The WBS was hand written and attached to a wall. The writing was small enough that you had to get within 18 inches of the wall to read it. It covered an 8 ft high by 20 ft long wall. There must have been 20,000 individual tasks on that chart. I'm sure that today it would be in Primavera or something like that, but it is still tens of thousands of tasks. No one is going to share that with you on a public forum.