Lifespan of hops

[Snakeshack]

I have about 15 packets of hops at about 100g each which I harvested last summer from my hop bine on the allotment ( fuggles ) .
They were dried in a dehydrator and vacuum packed within 8 hrs then immediately frozen,as I missed the harvest this year due to weather how long can I expect these to last.
I have been using to dry hop various kit beers to improve taste and aroma

 

[Gunge]

Dunno the 'official' answer but I very recently made a stout from last year's frozen homegrown First Gold - so about 13 months in the freezer - and they may have well been just harvested as far as my tastebuds could tell, though I should add that 80% of them were used for bittering.