I am typing this sitting in the waiting room while DD is doing vision therapy...
We were told it would be 6-8 months if we come twice a week. Probably a year if we come once a week. The "vision gym" is 45 minutes from school/ 30 minutes from home so a HUGE time commitment. It is covered by our insurance, though. I am estimating about $1500-$2000 out of pocket by the time we are done. Plus of course another few hundred dollars in gasoline costs.
DD is now 10 and I first noticed visual perception issues at 18 months. She has not only not caught up but her visual perception scores were 40+ points below her verbal comprehension scores so it is well worth it to us to give it a try.
