If you asked a believer of the heliocentric theory how long a year last, what would they say?

We view a year as the time it takes our planet to make one full orbit around the sun which is 365 days. The heliocentric theory is the sun-centered universe theory which has been proven and we currently use to this day. I'm not sure if you meant the geocentric theory with the Earth at the center of the universe instead.

That result from subduction of oceanic plates beneath lighter continental plates. most of the earth's volcanoes are located around the pacific ring of fire because that the location of most of the earth's subduction zones.