Seven of Ten

When you first start off with your package or nuc of bees they'll be busy building combs in their frames.  You will most likely give them sugar water to help them build faster.

Without the sugar they'd have to do a lot of foraging to get the energy to produce the beeswax. 

The question will arise, when do I add the next box to the hive?  The general rule is 7 of 10.  This applies both to comb building and also to honey supering.

When seven frames are drawn with comb it's time for the next box of frames.  When seven frames are filled with honey/capping in progress, it's time to add the next box.

I read about this seven of ten rule in my favourite beekeeping book, Beekeeping for Dummies.