Technically, the orbits of the earth and Halley’s comet do not touch each other, though they come close to each other at two different points. Halley’s comet comes through our inner solar system every 76 years, and has been doing so for millenia. There is not expected time this will cease. The last time Halley’s comet visited our solar system was in 1986.
To be accurate, Halley’s comet is part of our solar system, so it doesn’t “visit.” It is simply a question of its position in its orbit. As the other answer indicates, it will likely continue for thousands or tens of thousands of years, barring some accident or orbit perturbation that sends it into the sun or some other object.
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