How long do pellets last after opening?

[squeaksandcarrots]

It never crossed my mind to ask this until recently, but how long do pellets generally last after opening the bag?

 

[Piggies&buns]

I thought they said on the packet but I believe it’s either 3 or 6 months and then the nutrients degrade.

 

[Claire W]

I once asked this question when I used to buy 10kg bags and was told 3-6 months before they start losing their nutrients

 

[VickiA]

Ive always assumed they would last 3 -6 months.