Is it safe to leave a slow cooker on for 12 hours?

Online Answer
The general rule of thumb is that two to four hours is the maximum length of time you can leave food in a slow cooker on warm.
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Is it safe to leave stove on overnight? Absolutely not." While it's not the best idea to leave an open flame unattended, If you leave your stove burner on, your house will, in all likelihood, not burn down. UL tests just about every stove that hits the market..