A little over three years.
AVG is owned by the Gen Digital, merged from companies like Norton, Lifelock and Symantec. They support the cabal's agenda directly with their products. Do not trust them.
https://floridafamily.org/full_article.php?article_no=1071
You have no way of knowing the exact gallons per hour because you don't know the proportions to calculate the density of the fluid.