Delay between hackage upload and cabal-install seeing package

[Alistair Bayley]

I've uploaded Takusen-0.8.5 to hackage, and it's visible at
  http://hackage.haskell.org/cgi-bin/hackage-scripts/package/Takusen

but "cabal install Takusen" still tries to get 0.8.4. Is there a
separate database/file for cabal install which is rebuilt
periodically, and it so, how often? i.e. how long is the delay between
upload and being able to test cabal-install?

Thanks,
Alistair