Question

when does the next comet will be seen

Answer 1

Comet Halley is probably the brightest that will be visible in this century, it will return in 2061 and should be around magnitude -0.3 at its brightest, compared with its 1986 apparition, which was the worst in the last 2,000 years at a peak brightness of around +2.1 in the northern hemisphere.

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Answer 2

In 2062,
because last comet is seen in 1986 and comet is seen after 76 years.
I.e. 1986+76=2062.