I'm rendering a rather complex project, now well into the third day. That's not the issue. The issue is the "Eapsed Time (hh:mm:ss)" indicator keep resetting itself about every 24 hours.
I'm pretty sure it was the same in versions 4, 3, 2, and also in Video Factory.
Most likely the clock is in YYYY-MM-DD HH:MM:SS format, but only the HH:MM:SS part is displayed.
Never really bothered me much. I just pay attention to the percentage complete. If i remember about when i started the render then i can guestimate remaining time myself pretty easily.