Totally get that. It's like the motors are just humming along with no strain. I swear you can hear the difference between a good layer and one that's about to peel up.

My buddy had that same "met code" talk on a hospital job.

You're right about packing up early guaranteeing a loss. I've been there, freezing my butt off waiting for a sunrise that never came. But mark_smith59 has a point too. Last month I wasted a whole night on a lake because the fog just wouldn't lift. Sometimes you just gotta know it's a bust.