Minute to minute, hour to hour. The best intervention is therfore modification and alternate ways of accessing printed material. Books on tape for example. A dyslexic person can listen to a recorded book at 200 to 300 words a minute. NO remeadiation program can possible achieve that rate.
Comprehension is strong and interest is easily maintained.
We are getting ready to have a speed reading class where we will teach adults with these reading problems to silten at this reat or better. No all material can be understood at these rates but most can and the lowest speed would be about 150 to 200 words per minute. If the reading difficulty is for other reasons, remeadiation may be the best approach and would provide reasonable results. I run a program for college students is three colleges with these difficulties. All are doing well and some are straight A students.