Scale factor: 1 box = 6 inches

To convert the scale from 1 box = 6 inches to 1 box = 12 inches, you can follow these steps:

1. Calculate the original length in inches:
   Since 1 box = 6 inches, and the length in the scale drawing is 10 boxes: \[ \text{Length in inches} = 10 , \text{boxes} \times 6 , \text{inches/box} = 60 , \text{inches} \]

2. Convert the total length to the new scale factor:
   Now, using the new scale factor where 1 box = 12 inches: \[ \text{New length in boxes} = \frac{60 , \text{inches}}{12 , \text{inches/box}} = 5 , \text{boxes} \]

Therefore, in the new drawing, the length will be 5 boxes.

So the response is: 5