allow older posts to be considered fresh
allow older posts to be considered fresh

The limit was rather low before and presumably excluded planet
posts due to timing issues. The planet file is updated every
10mins and frank refreshes every 3, so a new post might be
considered stale already. Bump the limit to 90 and see how
that works.

koebi/frank,nnev/frank,breunigs/frank,Merovius/frank,Merovius/frank