4
From what I've been told, as long as they are stored correctly and dried they'll last for a long time
If they got mold Ig but if they are dried they should be fine unless your keeping them moist
I’m not sure but once my friend got some old shrooms from someone and they were like dust 😭 he did not take them lol
They’ve been in the fridge for like 2 months but some of them feel a bit squishy