I thought that as well when i was doing it, but it's not the case. Other people who were using Jeyes had to put a similar amount in, not really sure why. But it's not too much. I added the drops very gradually, did 6 ammonia tests until i got up to the desired amount of Ammonia, It took around 5 hours for me to eventually add a sufficient amount, so hopefully it can save you some time.
Also, this may seem like an insulting question, but it's not supposed to be, but it definitely is the Jeyes Kleen Off Ammonia? The reason i ask is because Kleen off is a line of products by Jeyes, and they do other cleaners in very similar bottles (i thought i'd finally found the ammonia, but it turned out to be some other type of cleaner). So, just making sure you aren't putting something nasty in there