bk - Just remember, the workers are working according to their schedule, not yours. -But I'm sure you already know that. And, who knows? -If you happen to go over there and confront them in person, they might end up truly adjusting their schedule to your schedule, if you get my drift.
*Just liken it to recording an album: First you make some noise (singing, playing, recording), and then you're quiet for a bit (listening, playback, editing).