My wife once worked for an Australian company which was having enterprise software customized by an Indian company. The time zone was definitely an issue, compounded by the fact that (due to rush hour and other factors) the Indian company kept relatively late office hours (~10am to 7pm local time).
The net effect was that if she sent an email during the day, the earliest she could expect a response from the Indian office was about 3pm Perth time, which realistically (giving an hour turnaround time) meant one round of communication in per day unless she stayed back past 5pm.
The net effect was that if she sent an email during the day, the earliest she could expect a response from the Indian office was about 3pm Perth time, which realistically (giving an hour turnaround time) meant one round of communication in per day unless she stayed back past 5pm.