The working hour again depends on you how you maintain 9.15 hours LOL.
but yes, it's one of the tough tasks.
I would say that the working hours should not be more than 8 hours a day.
Some teams have flexible office hours, but some need to come in shifts to provide 24x7 support. Average working hours of Infosys is 9.15 hours otherwise you will get auto-generated emails if it is less than 9.15
11 hours on average basis