One of the biggest questions businesses will face in 2021 is where — and when — employees can work. Companies may let employees work from home two or more days per week, with some opting for three days in office, two days remote and then two days off — or a so-called 3-2-2 work week — according to Ashley Whillans, a professor at Harvard Business School. Some employers may even cut down to a four-day work week altogether.