How long does my customer have to dispute a check? Jeff Swersky August 05, 2020 14:03 Updated Most banks allow up to 30 days from the time the check is debited out of your client's account. Related articles Is a signature required on a check? Can I check if my customer has sufficient funds before depositing? What is the difference between eChecks vs. ACH? What if I am unable to cancel a check? Will my bank accept printed checks? Comments 0 comments Please sign in to leave a comment.