'Workhorse' actors: How they do it?

About actors who consistently pump out multiple films per year (ex. Eric Roberts, Willem Dafoe, Nicolas Cage, ...).

a. Which other actors or actresses are such?

b. Eric Roberts seems to do mostly small parts. But Dafoe and Cage are usually in lead or supporting roles. How do they find the time? When considering prep, travel to location, actual filming and maybe press. Doesn't filming alone usually take 2-3 months for a film on average?

Note: Not sure if 'working actor' can also be the correct term for my question. Perhaps 'working actor' only refers to actors (usually lesser known) that need to take almost any job to stay afloat.

Update: Forgot to add Ethan Hawke as an example.