* No Central Database: There's no single, comprehensive database that tracks every actor's screen time across all their roles in every film and television show.
* Different Metrics: Even if such a database existed, defining "screen time" can be subjective. Do we count cameos? Do we include voice-over work?
* Ever-Changing Landscape: New films and TV shows are constantly being released, so the answer would be constantly shifting.
However, here are some factors that could be considered when trying to estimate:
* Long Careers: Actors with very long careers, like Morgan Freeman, Clint Eastwood, or Robert De Niro, would have a significant amount of screen time accumulated over decades.
* Prolific Actors: Actors who have starred in numerous films and TV shows, like Samuel L. Jackson or Tom Hanks, might have a high total screen time.
* Franchise Roles: Actors who play major characters in long-running franchises like the Marvel Cinematic Universe (Robert Downey Jr.) or the Harry Potter series (Daniel Radcliffe) would have significant screen time.
In conclusion: There is no definitive answer to your question. However, you can make educated guesses based on factors like career length, prolificacy, and franchise roles.