That sounds pretty consistent with my own experience.

https://developers.google.com/appengine/docs/python/memcache/overview#How_Cached_Data_Expires

If you want better guarantees you may want to star this issue:
http://code.google.com/p/googleappengine/issues/detail?id=6078


On Tuesday, September 25, 2012 3:48:09 PM UTC-7, Tom Saulpaugh wrote:
>
> I've been observing our production system memcache stats today and noticed 
> that the oldest object in the cache is only 7 minutes old.  On our test 
> system, running the same code, the oldest object is over 4 hours old.  On 
> our production system, I saw today at least 3 times where the oldest aged 
> object would get up to as high as 33 minutes but then fall back to 1 minute 
> or so.  We are using Objectify to set the cache expiration time for our 
> entity objects.  These times range from 10 minutes to 2 hours.
>
> Are there any known conditions where memcache is cleared due to errors or 
> quotas? (or something else?).  Has anyone else seen this behavior?
>
> Thanks,
> Tom
>
>

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