In my mind "4 day work week" means "4x8 hours", and "4 tens" means "4x10 hours". I have family that works 4x10 hours, and they usually refer to it as "4 tens".

In my mind "4 day work week" means "4x8 hours", and "4 tens" means "4x10 hours". I have family that works 4x10 hours, and they usually refer to it as "4 tens". It looks like some people go either way, though. Quote from the article: > Many employers aren't just moving to 10-hour shifts, four days a week, as companies like Shake Shack are doing; they're going to a 32-hour week — without cutting pay.