Russia has 11 time zones, America nine, Canada seven and Australia three. Should India continue to have only one? Last week Assam chief minister Tarun Gogoi revived the old debate on the wisdom of having more than one time zone in the country. This alone, he felt, would help the Northeast states to maximise their efficiency and productivity. Government offices in Assam, which remain open between 10 am and 5 pm as in the rest of India, Gogoi added, would open and shut an hour earlier. After all, Assam has followed for a century the ‘Tea Garden Time’, which is ahead of the Indian Standard Time by an hour.