I've been too lazy to figure out a way to get just 2 drops to come out of the bottle... so when I'm mixing up my ferts... I just pour the smallest amount in that I can... which is probably equivalent to 20 drops at least.
Too much won't hurt them will it? The only reason I ask is because I am not seeing anything happening at all as far as accelerated root growth is concerned, even with the large dose I use.