How we Allocate expiry date for prepare media.?

How we Allocate expiry date for prepare media.?

The manufacturer proposes expired date after preparation but you have to validate it

if you want to know expiry date of prepared media must be do validation protocol of this prepared media
1- prepared more bottle of this medium and keep in ref. and doing the test GPT at time interval maximum one month and Check also the physical properties of this medium through this month’s.