sorry if this is in rong place im new and still dont know al the rules but how often do they restock pir and sec grads?

That depends on the item you want restocked.
Lots of items wont be restocked, or only with a small amount.

I dont know actually what this depends on, part of the economy stuff.

ok i guess ill just wit for it

well, you dont really have to wait,
you can go down to the market forum and make a thread requesting whatever item you want
most likely youre gonna get it cheaper than it is in the torishop