No, the other signs stay around 2,160 average, while Ophiuchus just would take time away from neighbors Scorpius and Sagittarius and leave the same total. The actual astronomical boundaries based on the included stars have widely varying swaths of the equator, so the number of years of any sign can vary hundreds of years from 2,160.

The year has about 12-7/19 moons to it so it gets sometimes 12 sometimes 13. The great year is always 360 degrees, invariant, and they can be divvied up either 12 or 13 ways with any proportions you like.