Or until you sell through, which means you have to pay that advance back and then you'll start getting royalty checks. (thecreativepenn.com)
After a book earns out, the author receives royalty checks on a regular basis as long as the book is in print and still selling. (thebalancecareers.com)
Published authors might recognize their debut release, first royalty check, reaching a bestseller list, etc.. (jamigold.com)