The one Hour time estimate was probably written by some engineer who has never actually performed the task.
My job as a Structure AMT is to verify the Correct Part Number AND the Correct Effectivity assigned to the Aircraft that I'm installing the part on. Also verifying the Part Number on the documents that come with the Part. The part number is already determined for me in Boeing Drawings- Boeing Illustrated Parts List - Engineering Documents- Ect.
I do not have to know whether the part is a forging -casting - extrusion- ext. That is the job of Boeing and my Engineering Dept to instruct me which part to use. My job is to follow their written Instructions.