How Long Should an Original Battery Last?

[JustPassinThru]

The factory battery in my 2009 lasted the entire time I had it. No issues.

This in SPITE of how I accidentally knocked it dead; parking it for a month while I was traveling with another car. Interior light was on the whole time; the battery was completely dead. NO current - even the clock was dead.

Jump-started it; then left it run for ten hours, errands around town and idling in the driveway. But at the end of it, it was charged and held the charge - always started, even in zero-degree temperatures.