It depends on how much I need to focus on something (and what it is) in order to get it done. Normally: For coding, its probably spans of 75-90 minutes at a tim

It depends on how much I need to focus on something (and what it is) in order to get it done. Normally: For coding, its probably spans of 75-90 minutes at a time, before a break (20-30 minutes) is needed. After 2-3 periods, food is needed for energy. The cycle can go on for a large majority of the day before sleep is needed. If I'm focusing on design, the spans increase to 1-1.5 hours with the same cycles/time for a break ratio. I've cut back on my caffeine a lot in the past months, so if I really need a boost, a small amount of coffee/soda/energy drinks will help me out a lot more now then it would have a year or two ago. But once the caffeine wears off, I'm done for the day/night, unless I take more then what I originally took.