the human race will be lucky to survive - last time we barely made it - most assume it will be an event taking place in one or two days - but the huge area of such an eruption and the massive amount of magma could well make the event last weeks or months. The ensuing winter could last centuries covering the whole earth in time.
as I said, 4 billion people live in the danger zone with nowhere to hide or run to.
BTW..I misread your number...my bad.
Sorry about that.