If there was actually something to do in peacetime, I would've accepted these turn times. Like in CK2 with all that dynastic management, intrigue and feudalism, or Vicky2 with all that complex economic management, colonizing, diplomacy and population management. But the problem is, there is absolutely nothing in EU4 to do. This game is fun only when there is some fighting and map-painting going on, which means 15 years is a LOOOOOOOOOOONG time.
5 years of truce would be the best I think. 10 years is also a long time for a game that has nothing to do other than fighting to keep it fun. If you play someone like France or Spain, you can get enough enemies one-at-a-time to keep you busy for the next 15 years when you repeat the cycle. But when playing somone like Ming, those various Russians or the northern American tribes, you fight some war and bam, you have nothing to do for the next 15 years.
I wouldn't ask them to implement the Victoria II model though. That game is very awkwardly restrictive. You have only a century to play, and yet you have to go through huge 10 year truces, and you are not even allowed to break them at all, just because the dev hardcoded it for no reason. CK2 style truces with only 5 years are the way to go. 10 years might be good for balance and for preventing the likes of BBB, BWB and Ottoblob from steamrolling all over the place every half a decade, a time that long also creates bugs (and other problems, as someone noted above about the missions).
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