I have to also jump in here and disagree with you BB.
I believe an average of about 3 months in a given area is needed to become proficient.
Sure, we have the regulars, but the variation of on call pickups getting thrown into the mix, along with the learning curve of which time the shipper is truly ready at.
Just because it gives a 1600-1800 window might mean that particular customer is really ready at 1715, never mind daily variations.
Throw in the occasional Haz, international or bulk stop, and it gets complicated.
No , it's not rocket science, but a week just doesn't cut it.