I do not find any (( VOID AFTER 180 DAYS)) print on the check I received. So how long does the check will be still good? Thanks.
Its usually 6 months from the signed date for normal checks but there is no sign on adsense check which says this.
from adsense support: AdSense checks expire one year after they've been issued. If a check hasn't been cashed one year after the date that appears on the check, a stop payment will be placed on the check. When this happens, you'll see the line 'Check Expired - Earnings credited back' appear in your Payment History page. We'll then reissue these earnings in the next cycle in which you're eligible for payments.