Cougar, it tells how often glasses need to be treated, and how many applications you get with the 30 ml bottle, but I can't remember.
check the website- fogtech.com

never tried the laski stuff, but can you pull a thick neck gaitor up over your nose and your glasses still not fog up? I've put this stuff to the test, I know how good it works. try it guys, and let me know if it works as good for you as it does for me. don't forget, you get a free packet of 5 on your 2nd order. they'll send you an e-mail tellin all about it.

BTW- where can you get this Laski stuff? I'd like to try it myself and compare.