[numba888]

> but I cannot sustain that level of concentration for long periods

You can fix this by paying attention to it. When your mind starts wondering acknowledge this, take 5 min 'break' lazily thinking about the task. Then get back to the task. This is sort of mind hack.

Another way to control your thoughts is through meditation. A lot can be done this way. To summarize it: you can consciously control what you are thinking about. It's non physically hard.

[swah]

Can I read more about this? The "lazy break" in particular - is this something you personally came up with?

[numba888]

it's just a generic idea. if you want to do something try to not to force yourself. will power is a limited resource. find an easy way. 'lazy break' is sort of application of this idea. the task may be complex, just mentally step back, take a look at the whole picture, imagine next steps to do. all in relaxed way, may be walking, having a cup of coffee.

my problem is the opposite, sometimes i'm too focused and forget about the other thing to do. this lunatic state can last for days.