When we used a weighted vest with DS, his OTs always recommended wearing it 20 minutes at a time, with at least a 20 minute break between sessions.
The weighted vest worked well for DS for a while, but then he became very resistant to wearing it. I'm really not sure why. (He still loves to sleep under his weighted blanket though-best purchase ever!)
We found that compression clothing works a lot better for him. DS practically lives in the compression shirts from Fun and Function. (I love all their stuff; I buy a ton there.) He wears one as an undershirt almost everyday. We also have their mesh pressure vest and DS likes it a lot. I like that it's so compact that I can carry it anywhere and put it on him when he needs that extra "hug feel".
I also bought him the Howdahug chair (again from Fun and Function) and that thing is like magic to get him to sit still and concentrate.
Gena
DS, age 11 and always amazing
“Autistics are the ultimate square pegs, and the problem with pounding a square peg into a round hole is not that the hammering is hard work. It's that you're destroying the peg." - Paul Collins, Not Even Wrong