Employees in Mumbai, Hanoi, Mexico City, New Delhi and Bogota worked the most number of hours in a year, as per a study by Swiss bank, UBS. 

As per the report, an average employee in Mumbai works 3,315 hours in a year, making it the city that works the longest hours in the world. While Mumbaikars work for the longest hours, they are the ones with fewest vacation days. They only have an average of 10.4 days of paid vacation a year to enjoy.

The scenario in other parts of the world is rather different.  Employees in cities like Moscow, St Petersburg, Barcelona and Doha took more than 30 vacation days every year. And Riyadh, where employees took 37 vacation days a year, was at the top of the list.

When it comes to working long hours, Delhi is not far behind from Mumbai, as an average employee in Delhi works 2,511 hours a year. 

UBS as part of its Price and Earning Report 2018, collected over 75,000 data points from these 77 cities between January and April 2018. It assessed these 77 cities on various parameters including indicators such as price levels, earning levels, purchasing power and average annual working hours. 

Interestingly, Mercer's Cost of Living Survey 2017 showed Mumbai as the 57th most expensive city in the world, with a cost of living index of 32.05. Considering the high cost of living, Mumbaikars have to probably work long hours to meet their daily needs and basic necessities.