I'm guessing this is an average rather than absolute amount every day, and I also don't quite think it's possible to 'force' yourself to be more productive, as being productive is both about how fast you think, how fast you type and how fast you come up with solutions to a problem.
No matter how much you force yourself you can't just force yourself not to feel exhausted/restless/depressed or whatever else is effecting your productivity, you sure can alleviate these symptoms, but that's improving your well-being generally rather than forcing yourself to be productive.
So it sort of depends what you mean by force, I'm guessing it would just cause you more stress and make you eventually burn out because you're not in reality becoming more productive by focusing more, you're only stressing yourself out further.
No matter how much you force yourself you can't just force yourself not to feel exhausted/restless/depressed or whatever else is effecting your productivity, you sure can alleviate these symptoms, but that's improving your well-being generally rather than forcing yourself to be productive.
So it sort of depends what you mean by force, I'm guessing it would just cause you more stress and make you eventually burn out because you're not in reality becoming more productive by focusing more, you're only stressing yourself out further.