How different are the time zones? What frustrates me about remote workers is they cluster around eastern europe or india/china with main offices in the USA. T

How different are the time zones? What frustrates me about remote workers is they cluster around eastern europe or india/china with main offices in the USA. They're all hugely different time zones. I think remote workers who are in the same time zone area as the main office, say north or south america, might work better. But I don't know because I haven't had a chance to work on that kind of team.