[leafnode-list] Does 'expire' really mean what it says?

[Chris G]

At the top of my leafnode config file I have:-

    ## Unread articles will be deleted after this many days if
    ## you don't define special expire times. Mandatory.
    expire = 20

Does it really mean *unread* articles will be deleted after 20 days?
Or does it mean *all* articles will be deleted after 20 days?

-- 
Chris Green