TEMPORARY short-circuiting of cache duration calc
TEMPORARY short-circuiting of cache duration calc

We're having problems keeping precaches up to speed.  To ensure that
cached values are available (and we don't see the flying crow) keep
long-lived (> 2m) caches for one full day.  Short-lived caches remain
short, since they're ones that we want to update often.

DHTC-Tools/crow,DHTC-Tools/crow,DHTC-Tools/crow,DHTC-Tools/crow