How long can banana cake last?

I'm curious to know, how long can a banana CAKE typically last? I've heard that it depends on a few factors like storage conditions and whether or not it contains preservatives. Is there a general rule of thumb for how long a freshly baked banana cake can be enjoyed before it starts to go bad? Additionally, what are some tips for prolonging its shelf life, and are there any warning signs that it's no longer safe to consume?