For each life tick of the bee queen, you have a chance to produce 0-2 product combs and 0-1 specialty combs. So the 5.1 mins (which is pretty clear is equal to 5 min + 0.1 min*60 sec/min) is there to give you some kind of average time information based on that chance. If you can reach the 2 products+1 specialty / life tick (with frame housings), then you have maximized the productivity of the queen.
				
			 
				
		 
 
		 i'll never complete everything now, i'm already on 113 species so it won't be long before i'm stuck at 183 and can't get that Jaded bee.
 i'll never complete everything now, i'm already on 113 species so it won't be long before i'm stuck at 183 and can't get that Jaded bee.