Is it really people passing of as 80-Hour Workers, or is it that they just solve the tasks given to them without creating additional work for their bosses? Are

Is it really people passing of as 80-Hour Workers, or is it that they just solve the tasks given to them without creating additional work for their bosses? Are the successful guys fakes or are they doing something that we could learn to be more successful hourselves? In any case I would be interested in more in depth stories of these successful guys to learn from them. Choosing the right tasks to work on, for example, seems to be a very important strategy. I would love so much to read more details about how to do that. And especially in this case, if I would be the boss, I would appreciate people with that skill more than people without that skill. Someone with that skill will be able to pick most of the low hanging fruits and might also be more able to solve the really necessary ugly tasks, because he cares about getting it done.