3/4 thick at the fades to 1/2 at the tips.
Main thing when reducing staves to dry. Don't reduce width much. Keep the whole stave 2" wide. This will drastically reduce the chances of warping.
Thickness is the thing that will slow your drying times down. As long as you thin the limbs apprioriately it can dry quickly.Most importantly the handle area. Keep that full width until you string the bow at a low brace for the first time.
Once you have the bow braced you know where the string naturally wants to run through the handle. You then redcuce the handle to the strings natural alignment. No messing with heat trying to bend the handle or limbs to line up the string.