How long does one have as a trial period or guarantee period. I live in rural area of Manitoba, so by the time I get my card to pick up I normally only have 30 days to test. Honestly, I end up returning most, because MOst DO NOT WORK WITHIN THAT TIME PERIOD. If they say you have 90 days to test to see if product works, then of course I can properly have a better idea if the product is actually working.