I have medium 8 frame boxes that I'm going to be using. I ordered medium frame nucs and will be getting those in early may. The medium nucs are supposed to arrive packed full of bees.

My question is after transferring the frames from the nuc to the 8 frame box, since they are only 8 frame boxes, should I immediately add a second empty box on top of the first or should I wait a while? If I should wait, how long?

Thank you!