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Did a quick google and came up with this link. Don't know if these are the official in any sense of the word, though.
http://www.archivesofnethys.com/MagicJujuFetishes.aspx
Basically from what I see a juju will last for 1 week + x number of days where x = creator's caster level. They also have a 50% ( Minus 5% times caster level) chance to crumble away when identify or other similar magics used to divine magic properties are cast upon them.
So, for instance, a lvl 7 character creates a juju. It will last for 14 days (1 week +7), and have a 15% chance to crumble (50% - (5% x 7)).
Hope this helps.