20 hours
it took as long as it took me to musterbate
It took 5 years to build.
it took 3 years
it took 3 years to build the shard
it took him 5 years to build it
it took 500 years to build the CHeops
It would take 20 hours because you have half the men, therefore it would take double the time.
20 hours
It took 273 days for them to build the pyramid
it took 15 years to build the terracotta army
it took 30-40 years to build a pyramid
It took 5 years to build the Ziggurat