When describing a time or distance, or both at the same time a single unit of measure should be used. The unit of banana can be used to describe a time, a distance or even a rating scale for hotness of people.
That walk is so long it must take 339 bananas to get there. I cannot believe it took me 87 bananas long to finish that pizza.
Me: I'd rate him about 455 bananas.
Friend: Damn girl he must be hot!!!