I actually have exactly a clock as a mental model of the year and the seasons. December is 12 o' clock.

But weirdly, I dont have a mind's clock to represent the day. Precisely because it feels to me that the clock shape is unfit to show time. Because 03:00am feels wildly different from 03:00pm. My mental representation is a 3d spiral slightly offset and looping back on itself. So imagine two clockfaces when looking from up top, seethrough. The bottom one is a bit to the left so you can see both well. Each consecutive number goes a bit higher. After 12 midnight the numbers quickly decend down back to 06:00am. I have this image for as long as.I remember.