Sean from Antifada seems to be really interested in the idea of non-linear time, and it came up a bunch in a book I just read by Tyson Yunkaporta, Sand Talk, in reference to indigenous conceptions of time.

I don't think it has much bearing on the physics of time (that kind of non-linear time might exist but it's a different thing) actually. I think it has a lot to do with how we measure and chop up our hours, days, and months, as well as our assumptions about the trajectory of society, and up to and including the philosophical mud like eternal recurrence.

I like to imagine how I would conceive of a day or a week if the environmental pressures and the social norms were very very different.