QV 50ml test 250, how long will it be good for?

If I buy a 50ml of QV test enan 250, once the rubber stopper is punctured, how long would it keep it's potency?

Once any aas is open how long does it keep it' potency?

Will it keep as long as it has not passed the expiration date?

Thanks
JohnnyB

I'd imagine it would be good for a couple yrs...

it will last for years,even after exp date.shelf life will depend on how and where is it stored

I would say at least 6 months after the exp. date. Sometimes even longer.

Thanks

JohnnyB