Unidentified subject!

[Hector Quin~ones]

We have   the cache full with objects (journals and books about medicine
and health, freeware on the 
Internet). We need that these objects lived in cache about 10
days(reference_age 10 days), exactly as they are. We 
mean without refreshness. Our problem is that the replies are very slow.
We need this information faster.

So, we do not want to check against origin server for any request. What to
do in Squid.conf???
Thanks in advance
Hector