Just judging on how long 7.62x39 lasted way cheap before it began the slow trickle up, I would say that the 5.45x39 would last for 5-10 years. Thats just my estimate taking into account the hoarders out there as well.
The 5.45x39 along with the 7.62x39 was made in bulk for the cold war and we haven't even scratched the top of that supply.
It's better that we shoot it than who created it though.Kind of a weird thought. . . . shooting ammo intended to go to war with our own country.
It's better that we shoot it than who created it though.