That all depends on the comet Halley's takes about 76 years where as Hale Bopp takes about 2300 years. Its the same principle with the planets the closer the orbit the faster it goes. Some Comets like Hale Bopp come from the Oort cloud about a light year away that is why it takes so long, where as Halley's goes out round Pluto and back again.
The same as the Earth
Halley's Comet orbits the sun, not the earth, roughly every 76 years.
Halley's Comet returns once every 75-76 years.
Define "normal" - it varies from a few years to many centuries.
Halley's Comet takes 73.5 years to orbit the sun but every comet is different just like planets.
76 years.
2,537 years
It is called an orbit. A comet has an eccentric or parabolic orbit.
The Sun
Every comet has its own orbit and its own timing in terms of how long it takes to orbit the sun.
An orbit
about 76 years