The India time gap shapes NRI life more than almost any other practical factor, and each direction has its own personality. Indians in the Gulf deal with a small gap of a couple of hours, which keeps family calls easy. Europe sits a few hours behind India, so evenings abroad line up with late nights back home. North America is the tough one; the gap is large enough, and inverted, that one side is always sacrificing sleep for a call. Australia and East Asia run ahead of India, flipping the equation the other way.
Professionally, the difference cuts both ways. Working with Indian teams from the Americas means early mornings or late evenings for someone. From Europe, the overlap window with India is actually decent, which is partly why so much India-Europe collaboration works smoothly.
The adjustment that matters most is emotional: fixed weekly call times with parents beat spontaneous calls that keep missing.