I go 32 hours of cold smoke... but I break it up into (4) 8 hour smoke sessions overnight resting the slabs in the refrigerator during the day. Cold smoking bacon is a lot like dry curing, you are drying the bacon out but with presence of smoke. High humidity aids in the drying, just like when dry curing, which is why cold smoking at night is beneficial, such that it usually has a higher ambient humidity at night and cooler temperatures.....
Try 32 hours Steve, it'll blow your socks off! At least that's my preference....but I'm a smoke hound, I love deep smokey flavor on bacon.