I bet you have seen people working for 10-12 hours a day which is definitely exceptional and then we start looking up to these people as “Wow! He is an amazing worker, he works all day.”
Yes, they are working all day but that doesn’t mean that they’re productive (they can be though but working for a long duration means that they’re busy and there’s a difference between being productive and busy which we might not notice).
Productivity is based on your efficiency, it’s not about how much time you spend on doing it but about how much you have got done. Productive people are clear about what they want to do and devote their time towards the important things. Hard work and efforts are important but you should know where you’re putting the efforts in order to be constructive. A productive mind is relaxed and does only what’s needed at the moment but they do it in the best way. Decide between what has to be done and what has to be done right now and then just get started!