RoccondilRinon said:

You know, that could count as evidence that that part of the story takes place overnight.

I'll just be over here. Popcorn anyone?

Well, that doesn't really jibe because when Luke is making his approach to Cloud City, it's broad daylight out, and within a minute or so of this bit with Lobot, we see Luke walking down the hallway with perfectly blue skies outside behind him. I gather that the Falcon lands at the break of dawn, and by the time they escape, it's sundown. We never see any night skies on Bespin.

-NJM