how long are postal orders valid for
Report Abuse. A money order is only valid for 120 days. You might be able to contact western union and tell them your situation and see what they can do to help you.I mean the money was paid to them and never paid out so they don't just get to keep your money, no matter how long it has been. Jackie Â· 6 months ago.Thumbs up. just now. Report Abuse. A money order is only valid for 120 days. You might be able to contact western union and tell them your situation and see what they can do to help you. I mean the money was paid to them and never paid out so they don't just get to keep your money, no matter how long it has been.