No, a planet's mass doesn't directly affect how long it takes to orbit the sun. The orbital period (the time it takes to complete one orbit) is primarily determined by the planet's distance from the sun.

Here's why:

* Kepler's Third Law: This law states that the square of a planet's orbital period is proportional to the cube of its average distance from the sun.

* Gravity: The force of gravity between the sun and a planet depends on their masses and the distance between them. While a more massive planet experiences a stronger gravitational pull, this pull is balanced by the planet's greater inertia (resistance to change in motion).

In simpler terms:

Imagine two planets at the same distance from the sun. One is massive, and the other is small. Both will experience the same gravitational force from the sun. Since the massive planet has more inertia, it takes more energy to change its motion, but it also has more energy to maintain its speed. This balance means that both planets will orbit at the same speed, taking the same time to complete one orbit.

Therefore, it's the distance from the sun, not the planet's mass, that determines the orbital period.