5/10/16- I will be updating this later today with more specifics for the data miners like me. I will put down Boss and specific items earned. Here is a breakdown of all my three of coins usage for the past three of weeks. This first set is using the 3ofc with no wait time. Just using them one right after another. The second set is having a 10 minute timer. The third set is using a 15 minute timer. And the last set is using a 20 minute or longer timer. I only used one coin at a time, so the results will look like this "6-3ofc's= primary" [u]USING COINS ONE AFTER ANOTHER.[/u] 18-3ofc=primary 4-3ofc=boots 12-3ofc=boots 10-3ofc=gauntlets 16-3ofc=special 21-3ofc=primary 17-3ofc=primary 10-3ofc=heavy 1-3ofc=boots 3-3ofc=boots and gauntlets 27-3ofc=primary 18-3ofc=special 20-3ofc=boots 12-30fc=boots 16-3ofc=boots 7-3ofc=gauntlets 32-3ofc=boots 17-3ofc=gauntlets 19-3ofc=boots 3-3ofc=primary 25-3ofc=special 10-3ofc=gauntlets 9-3ofc=boots 5-3ofc=primary 1-3ofc=chest 3-3ofc=chest 16-3ofc=special 6-3ofc=chest and gauntlets. 3-3ofc=special 6-3ofc=boots 16-3ofc=special 6-3ofc=gauntlets 8-3ofc=primary 6-3ofc=heavy [u]THIS SET IS WAITING 10 MINUTES.[/u] 8-3ofc=gauntlets 22-3ofc=gauntlets 12-3ofc=boots 10-3ofc=primary 4-3ofc=primary 8-3ofc=boots 6-3ofc=gauntlets 12-3ofc=special 12-3ofc=gauntlets 19-3ofc=boots 22-3ofc=boots 15-3ofc=boots 7-3ofc=boots 14-3ofc=boots 5-3ofc=gauntlets 8-3ofc=gauntlets 9-3ofc=primary 29-3ofc=special 8-3ofc=boots [u]THIS SET IS WAITING 15 MINUTES.[/u] 22-3ofc=boots 7-3ofc=boots 21-3ofc=primary 16-3ofc=primary 10-3ofc=gauntlets 27-3ofc=boots 12-3ofc=boots 3-3ofc=gauntlets 17-3ofc=primary 10-3ofc=helmet 11-3ofc=boots 4-3ofc=gauntlets 7-3ofc=special 31-3ofc=boots 6-3ofc=special 10-3ofc=helmet 4-3ofc=boots [u]THIS SET IS WAITING 20 MINUTES OR MORE.[/u] (sometimes this one is a mix of times. like yesterday. I had to interrupt a back to back farming run and came back an hour later and got a exotic.) 6-3ofc=boots 6-3ofc=boots 15-3ofc=primary 17-3ofc=primary 28-3ofc=boots 21-3ofc=gauntlets 5-3ofc=heavy 6-3ofc=gauntlets 39-3ofc=boots 4-3ofc=gauntlets 16-3ofc=primary 20-3ofc=primary 22-3ofc=heavy 10-3ofc=chest 12-3ofc=gauntlets 32-3ofc=secondary One thing I have noticed is this. Don't pickup your yellow engrams when they drop. By letting it go to the post office it seems that your chance of getting a yellow faster increases. If you pick it up and its in your inventory, then it is likely to be longer before your next drop. I might as well go and say it because someone is going to come up and say "NO way!, nobody can afford to buy that many 3of coins". YES THEY CAN! Specially when your Scrooge McDuck with your vault and a day one player. Yea, I have blown through a lot of 3of coins and a crapload of strange coin. But for me, there has never been anything for me to spend strange coin on. At one time I had just over 15000 strange coin. So whats my conclusion? There is no timer. My quickest time between drops was doing them back to back. The Cosmodrome is the best place to farm for exotics, next to winters run and eye of the gatelord. Low level bosses give the same chance of a drop as the high level bosses. In the end, it is still RNG. All random. Make sure you have your highest overall light level on when you decrypt them. So, hope this helps some peeps figure this out. I will keep updating the numbers as I get drops. 5/7/16- I finally got the Zen Meteor and the gauntlets at 335, but don't want to infuse the zen. So will have to wait for another 335. 9/11/16- The 30fc's seem to be tied to the boss your fighting more than usage and a time limit. If you fight the same boss over and over, your chances of a drop fall each time. Meaning it may take many tries to get a drop. But if you rotate the killings between bosses and cruciable? you should be able to get drops somewhere in the 3 to 5 coins usage..