as per the bank rules check is valid for 6 months from date it is issued. Still you have to confirm abotu google check
In most countries, any cheque, by default, is valid for 6 months from the date of issue. But why would u want to wait for 6 months or 12 months or 3 months anyway? Its your money, drop the cheque at your bank and get it cleared at the earliest.
I think checks are valid for three months and you can cash them anytime between this duration . Our checks are valid for six months but everyone says company checks are valid for three months .
I confirmed from adsnese help center and there its validity date mention for 6 months but adsense support guy told me its for 1 year in the end of 2007