My dyslexic child needed 30 min a.m. and 30 min p.m. to remediate and make it work. I agree 20-30 min/day may not be enough
I also agree with what Katigre said about other subjects.
We did A LOT of things. Before making a recommendation, I'd need to hear what specific deficits? Visual dyslexia? Phonological dyslexia? Working memory? Comprehension?. Typically it is visual and/or phonological and working memory with comprehension skills. BUT there are different severities within each deficit. There is actually a wide spectrum range within the dyslexic classification.
My son has both visual and phonological dyslexia with a severe working memory deficit. He was also dysgraphic. However, his comprehension was OFF THE CHARTS (which is not typical. His huge strength can be his Achiles heal though
). He STILL guesses occasionally on very long multi-syllable words. Just because he's reading quickly.
The gold standard for dyslexia remediation is typically Orton Gillingham and the Scottish Rite often has free dyslexia tutoring. My dyslexic had to go through lindamood bell to remediate his phonological dyslexia (the ability to HEAR different sounds) before he was able to handle any sort of Orton Gillingham. Because of having a more severe than is typical working memory deficit, he had to use several different curriculum before actually remembering it.
What CAN he READ? (type up a sentence or paragraph -- I am not sure we used AAR 3 but I am going to go dig around here. I have gobs of used resources sitting around).
Can he rhyme? Can he cross his midline? Can he hear the difference between b, d, p, t? (or any other sounds that are similar). Can he listen to you sound out a word like fast (fffffffffaaaaaaaasssssssstttttt) and answer "fast"?
Is it visual? What have you done on the computer? What worked and what didn't work?
That's off the top of my mind. I'm thinking I'd have to dig through buckets to find any actual resources.