As for human mages, I had already decided that 1,000 Earth years is the upper limit for their life-span. Technically, a mage could live longer than 1000, but without significant modifications to the brain/body, they'd be completely senile for anything past 1000. Senility becomes a serious risk around age 930 or so.
Oh, and I might slip in a little bit about one specific part of the Bible being true: Methuselah and other long-lived humans really existed on Earth, once upon a time; they were mages. This was back when magic was just as potent on Earth as it is on Orion. But at some point after Jesus Christ's life, something happened that all but killed magic on Earth. Magic has been slowly recovering ever since.
Back to Orion's year... Orion is a strange planet. It was artificially created by the Vecerti (Gods). It could not exist without magic, either, as it is impossibly big. It has the surface area of Jupiter, and is hollow (reducing its gravity), supported on the inside by a shell of adamantium, and adamantium beams. There are life-forms that live in the hollow realm, and there are portals extant to go back and forth between the surface and the Hollow.
With that already existing weirdness in mind, I think I'm going to add to that weirdness. It's probably a massive violation of the laws of physics, but hey, Orion already is; Orion's year is basically the same as an Earth year, and its day is just slightly longer than Earth's day... hmm... maybe a 30 hour day? With 15 hours of night and 15 hours of daylight? Hmm... sounds about right. Of course, this makes an Orion week 42 hours longer than an Earth week. *ponders* *shrugs* (Also, a 31 day month on Orion is 186 hours longer than one on Earth. Which means that if they used a similar calendar, their year is 91.25 days longer than ours. Any math beyond that point gets me into Ye Olde Realms of Confusion.)
Why I made Orion so weird, when I first thought of it, I'm not really sure. Though it IS one of the biggest battlefields in the wars between the Gods.
Crossposted from http://fayanora.dreamwidth.org