Why worry about it. Go out and buy a 2X, 3X, 5X, etc. all the way up to about 300X. Then you can be the one answering this question the next time it comes up. I use a 5X and if it takes more than that, I'll just pass.
I use an Optisight Visor with a 7x lens. If they made a 10x or higher I'd definitely buy and use it. It may have something to do with the fact that it is binocular and there are focal length limitations.
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