India is starved for electricity: in Chennai, the South Indian megacity where the launch occurred, rolling blackouts cut the power for two hours each day.

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And, with a power shortage blacking out large parts of the country for two hours each day and unemployment rising sharply, there are plenty of other things to think about.

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Hill attributes his investment success mostly to his membership in ValueForum, which he logs on to each day for about two hours to trade ideas.

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Her message to parents is that two hours of screen time each day is enough for children aged six and under.

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