How quickly can the Federation build a Galaxy-class ship?

How long does it take the Federation to build a starship?

For Enterprise, the evidence suggests about two years of construction, with a mature Federation industry able to increase output when needed.

The class's long development program is separate from the physical construction of an individual hull. The available dates suggest Enterprise was built between about 2361 and 2363, although the exact interval remains debatable. Later numbers imply that an established industrial base could produce many more ships when strategic demand rose. A difficult design phase and a fast repeat-construction phase can coexist once yards, suppliers, and workers have mastered the class.