That makes sense. Although this would only account for a percentage of the ledges in a lake, it's a great point (no pun intended). You mentioned morning and evening, do you waste your time mid-morning to mid-afternoon? Do baitfish need to be present in the morning and the evening?
Baitfish is key. I found some to produce all day when they are windswept pushing baitfish up on them. Ledges that mimic stairs 5 to 10 to 15 feet are goldmines and may produce all day long working different depths throughout the day. Table Rock and Kentucky Lake have these features.