So as a fellow ADHD sufferer... I find that if it is something I have to read and completely not interested in but have to I will do it in segments... from a paragraph to a page at a time.

If it is something I enjoy like fictional novels I usually don't have that problem. However if it is losing me I will do the same tactic.

I found this method works for a lot of things especially homework.

Instead of 1hr of work and a 10min break I do 10mins of work and take a small break of like 2-5mins and continue to do this until my total work time is 1hr. Granted yes my 1 hr is actually like 1.5-2hrs total but the 1 hr of total work IS in fact done.