My landlord at the place I lived before this one, honestly he left the stove on at least a couple of times ooh AND one of my flatmate (aka roomies) did this a LOT he just forgot he’d left the gas on. I just got into the habit of for eg before work checking the stove every day and turning it off if it had been left on. With both people I don’t think they’d left it on very long maybe an hour or two - made breakfast using it, I think. Sometimes I’d think OMG what if they leave it on when I’m NOT there 😱 then I’d be like well if they do they do 🤷🏻‍♀️