Which of these life activities is (more or less) constant in time needed to do the work, no matter how big the task involved

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Painting a house (doghouse, bungalow, 8000 sq ft. Martha's Vineyard estate, the Biltmore)

Dumping a load of gravel that is in a dump truck (1 cubic yard, 9 yards, 25 yards)

selling a piece of property (1/2 acre 'burb, 10 acres estate, 1000 acre ranch)

All are constant time