How to pre-cache model data?

I need my Django app to poll data in DB regularly (say once every 3
minutes) and cache the data. I have some queries that take up to 20
sec. The users must never wait this long for response from my app.
What is the must natural way to go about this in Django?

I know that I can use memcache, but that way the users will once in
while have to wait a long time while the cache is being refreshed.

Best regards,
Helgi Borg

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