Tata Consultancy Services (TCS) has asked its employees to return to offices in preparation for the IT major's '25/25' model, which is expected to be implemented by 2025. "Under the new model, by 2025, no more than 25 per cent of our employees will need to work from the office at any given point, and will not need to spend more than 25 per cent of their time in office," a TCS spokesperson said on Tuesday.