Crawl space inspections can take a significant amount of time because in certain crawl spaces the inspector  must literally crawl in order to get to the places where he must inspect for telltale signs of subterranean termites and other wood destroying organisms.

Termites on wood

Termite mud tubes behind wall paper.

Termite mud shelter tubes descend from floor joists and subflooring in crawl space.

Extensive termite mud tubing and damaged wood in crawl space.

Extensive termite damage to structural framing in crawl space.