McDonald’s on the other hand… changes their frying oil every two weeks. 8 hours by 14 days
As a quick point— McDonald’s fryers are not turned off as much as you think. At a 24 hour location, the fry/hash oil never turns off. The chicken fryer might be turned off between 4am and 11am if there’s no breakfast item containing chicken. Often it just gets left on so no one can forget to turn it on.
One thing to consider also, is the burnt food remaining in the fryers for many hours. Additionally, oil topped up between changes.
I don’t remember how often we changed the oil but I thought it was once per week. It was a 24 hour location
As a quick point— McDonald’s fryers are not turned off as much as you think. At a 24 hour location, the fry/hash oil never turns off. The chicken fryer might be turned off between 4am and 11am if there’s no breakfast item containing chicken. Often it just gets left on so no one can forget to turn it on.
One thing to consider also, is the burnt food remaining in the fryers for many hours. Additionally, oil topped up between changes.
I don’t remember how often we changed the oil but I thought it was once per week. It was a 24 hour location