Ah so you have little idea of how industries work
There are multiple companies other than retail that work 6-7 days - banking services, security, medical obviously, even fashion (non retail)
Also the idea that you get 52 weeks of no work is aspirational. People in advertising, consulting are working 5 days from office and 2 days at home
The annual leaves, the bosses hardly approve them, and if they so you come back to piles of work loaded
Work life balance is much needed.
Narayana Murthy didn't ask people to work 70 hours for Infosys. He mentioned as generic terms, for youngsters who should create for India, startups in basic terms