An actor may have multiple films release in a year, but that does not mean they were shooting for them all simultaneously.
Shooting is just one part of the filmmaking progress. There is a whole post-production process involving editing, mixing, cgi, color correction, etc. This can take a few months to years sometimes. Post-production can often take more time than the actual shoot schedule itself.
The project management and efficiency of the director and support staff also play a role. Some directors have a very clear cut vision and can execute shooting on a compact schedule. Some directors have a good vibe with their set crew and things fall in place with minimal direction. Other times directors are scattered, tend to dawdle or overthink details, have to spend a lot of time getting everything right.
Finally, the actor's hard work, diligence, ability to follow instructions, ability to work on schedule, and require minimum takes also plays a factor.
It is not uncommon for actors to have to walk out of films or be dropped because prior commitments took way too long. It is not uncommon for films to sit in post-production for years before finally seeing the light of day.
All this factors into an illusion that the actor is working super hard because they had a dozen releases in one year or that an actor has no work because they haven't had a release in years.
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