How long do offline maps last on Google Maps?

Google Apps allows you to save maps offline, but how long do they stay on your phone? Here's what you need to know and how to ...
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I used Android Auto's offline maps on a road trip with no signal, and it saved my drive

Offline maps are the Android Auto feature nobody talks about, but every road tripper needs.

Even if you save Google Maps, you cannot display walking directions offline: Check the means of transport, range, and expiration date before you leave

"Use navigation offline." The heading on the Google Maps help page says this, and it can be read as meaning that if you save a map before you go out, you will continue to receive directions even in ...

This hidden Google Maps toggle eliminates the worst parts of walking routes

No more stairs or steep inclines ...