1 oz of fluid is about 500 drops. If you are looking for a mixture:
1% = 5 drops
2% = 10 drops
4% = 20 drops
I use about a 2% mix for regular resin. I use about twice that much for gelcoat. Gelcoat takes longer to dry. Gelcoat is, in effect, resin, pigment (for color), and a thixotropic material. The additives retard the gelling properties of the resin.

If you really want to know and are interested do this experiment. I took some resin classes in college and one of the requirements was to see what resins, gelcoats and epoxies did with different hardener ratios. I took an icecube tray, put equal amount of the same product (ie resin) in each of twelve compartments, then catalyzed them with different amounts. Start with lower than recommended, say 1/2% and increase by 1/2% each until you get to about 6%. Do not stand too close, that 6% will smoke. See how long it takes for each to harden. Your hot one will harden in minutes and probably crack. The slow one may not harden for a couple of days. You will get a really good idea about how your resin reacts and know what you will be comfortable for you.