The best thing to do is to train your focus in a longer period. Try holding your focus for 48 hours untill you crash an go to sleep to jump up again in the morning to continue.
I've managed to train my focus in such way that I was able to continue making 18+ hour days for over 8 months straight. The times that I did lost my focus during the day (or 48 hours) were experienced as bridge periods (1-2 hours) to the next period in which maximum focus and speed where available again.
Untill 2 months ago, I usually worked 48 hours in a row twice per week, but after reading some scientific research on the effects of jetlag and the importance of biorithm to the body I am currently working on a strict schedule and 8 hours sleep per day and started professional fitness to keep my body in shape (7 times per week).
Something that might help however (for the ones that already are able to focus 100%) is the supplement Chlorella, an algae that will boost your energy and ability to focus. It really works very well.
www . mercola . com /chlorella/history.htm
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