if you are going to be scanning the film and not contact printing them you might be able to cut the time by a few mins, not much though caffenol is kind of slow and deliberate, i think that is why the film rescue person suggested it, its foolproof in a way ( unless you didn't get the right ingredients ): The carbonate you can use super washing soda from your grocery store ( if you can't find it there, get baking soda and put it in your toaster R oven to evaporate the moisture from it ), and vit c ... is sometimes tricky. If you have a whole paycheck near you you can find it there in the supplements lane, better yet trader joe's same stuff cheeper $$ or everyone's favorite mail order .. the South American Jungle. Have fun !