I would recommend that you encourage your employees to report to work on time and leave at the close of working hours. Thirty to forty-five minutes stretching beyond the close of working hours occasionally is okay. Please note that we need to consider the time required for the employee to commute back home from the office.
If the trend of extended working hours continues, employees will complain about work-life balance.
Considering one hour of commuting and eight hours of work, on average, an employee spends 40% of their day at work. If the working hours themselves are stretched on a regular basis beyond eight hours, their working efficiency will be affected.
I know of an organization wherein the company curbed late sitting by simply switching off the electricity for 15 minutes in the office area, 10 minutes after the close of the working hours. Employees had to move out and resume work after the power was restored 30 minutes later, without air conditioning facilities. Though there was initial resistance, employees started feeling comfortable with this move and cooperated wholeheartedly as they could spend quality time with their families.
Regards,
MVK