You better cash it as soon as possible before your account gets banned and your check canceled.... I've never heard of a google check being canceled but I wouldn't put anything past them
Google is 6 months but as they pay in your own currency i dont see the point in waiting to cash it. As i live in the uk and you pay commision for paying i checks not in your currency i tend to save these until i need the money.
I'm not rich enough to accumulate checks for the fun of looking at them or swimming in a pool of checks. That Trump fellow... probably.
I don't see any reasons why you should way to cash your cheque into your bank account. Just my opinion.