What was the approximate maximum magnification Galileo achieved after refining the telescope design?

Answer

Twenty or thirty times power.

Galileo Galilei quickly refined the initial design, grinding his own lenses to achieve magnifications up to twenty or thirty times power, whereas the initial instrument offered only about three times magnification.

What was the approximate maximum magnification Galileo achieved after refining the telescope design?
inventionastronomytelescopesciencerevolution