I was only gone a week.
But the Moses scene is still!!! running (another 400 hours, but don't know why).
The moses scene was running on both cores and took up about 90%, so this scene, on both cores as well, got only 10%. So the render window timer said it had been running for 260 hours, but the task manager cpu timer said it only got 46 hours of cpu time, counting both cores. So 10% of 260 is about 25 hours of real computing time on both cores at once.
So it didn't take that long to render, except for the fact I was rendering something else as well.