Been doing a bit of reading on attention span and activity, it takes 15 minutes to get into the flow of a task without any disruption factor.
If you enjoy the task you can sustain focus for about 40 minutes without a rest.
If you do not enjoy the task, a change is as good as rest, walkaway from the job.., look at something in nature for 10-15 minutes then refocus on the task, you will find it will be easy to do second time around, failing that, go back to nature, have a walk under the trees.
Crystal, @ good points 
, I agree, I think you have to know yourself and what works for you and do not work in an environment which goes against your grain so to say. But enjoyment and intrisinic feeling do help you focus better.
Jon, @ I think that with my autism
, I need a slow and focus without disruption so that I do not feel underpressure or overwhelm. If anything this slower approach makes for a better job long-term/result. The attention span for me, seems to be an ALL OR NOTHING focus. lol 
I thinks there is three focus levels, snail, turtoise and rabbit, but we are primarily one of three.
Crystal, @ good points , I agree, I think you have to know yourself and what works for you and do not work in an environment which goes against your grain so to say. But enjoyment and intrisinic feeling do help you focus better.
Jon, @ I think that with my autism, I need a slow and focus without disruption so that I do not feel underpressure or overwhelm. If anything this slower approach makes for a better job long-term/result. The attention span for me, seems to be an ALL OR NOTHING focus. lol
I thinks there is three focus levels, snail, turtoise and rabbit, but we are primarily one of three.
