Thank for the reply. I'm not sure what "sunny 16" means exactly or how you calculated your 12 stop filter strenght.
I think 10 stops is the darkest they are made and from the research I have done online that is more than you need. People have gotten 2 or more minutes exposure in daylight with a 10 stop.
What I'm wondering is will a 6 stop be fine for anything between 30 seconds to 1 minute? I don't need/want to do 2 or more minutes of exposure because I don't own a cable release
Check out this video... it's awesome and very explanitory. The photographer uses a 10 stop but he also keeps the shutter open for 2 minutes.
It sounds like you need to do some reading on what a stop actually is. For your question though:
6 stops = 2^6 =64 times as long as without a filter.
10 stops = 2^10 = 1024 times as long as without a filter.
So under the conditions, iso and apperture settings which give a 2 minute exposure for a 10 stop filter you'll need about 3 or 4 seconds with a 6 stop filter