I still think 72 hours is way too long as it rewards camping and early pulling. People who actually have real life jobs and obligations will have a lot of difficulty getting Ixion unless Ixions just happens to spawn when they're on. Upping the horn drop rate helps but it doesn't fix the problem that arriving early enough to the Ixion fight to get gold is a difficult task in and of itself.

As it stands now though, people early pulling Ixion is pretty common, at least on Siren. I camped out Ixion for 15 hours and was at the entrance of Porta Praetoria in another instance when he spawned, and was notified immediately of his presence by a party member who was camping the instance. He was pulled only a minute after I arrived at the FATE. One thing you have to consider is that Ixion was up for only 7-8 minutes in a 36-72 hour spawn window, and no one can predict when he will spawn. With those odds, you either have to camp him out like I did or be lucky that you're on and immediately informed when he spawns.