Well i can only respond to the first two but here goes...
1. Good question. It depends on the environments that you have tested it in. If you feel that you have tested extensively in a lot of environments and situations, then its time to put it too rest. You might also want to tweak the ratios a bit.
2. Most products last for between 4-6 hours, but you will find that the effectiveness drops off the -nol products faster than cops, I\'m guessing.
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