Guess I'm lucky, I've only seen 2-3 day delays generally. Sometimes as much as a week.

What I have noticed recently is some bizarre routing / timing. Three recent examples:
Brunswick GA -> Jacksonville FL -> Tallahassee FL -> Aurora IL -> Madison WI -- longest leg (FL-IL-WI) took the shortest time (25 hr)
Lakeville CT -> Springfield MA -> St Paul MN -> Madison WI (only way to MN from points east takes you through/past Madison)
Washington DC -> Southern MD -> San Antonio TX -> Madison WI (at least this one didn't go through/past Madison on the way....)