Normal range as defined in what I see or heared being used over a wide range of F16 masts and sails (see Matt's comments) is :

30 mm to 70 mm spreader rake

I'm running 48 mm myself (superwing mast from 2002 and a 2003 redhead mainsail with a luff curve cut for a 150 kg crew but also with an issue in the very top requiring me to always run lots of downhaul).

Wouter