Nation The clock is ticking on those Thanksgiving leftovers. Here’s how long before they go bad November 28, 2019November 29, 2019Joel Shannon, USA TODAYComments Off on The clock is ticking on those Thanksgiving leftovers. Here’s how long before they go bad 'Tis the season for food poisoning. Cases spike around Thanksgiving and Christmas, thanks in part to mishandled holiday leftovers.