The stimulant effect will hang in about 30-60 minutes after the peak effect subsides.
If you intend to use this sublingually, I would strongly suggest an alcohol based tincture.
I personally have never used the traditional method of using leaves rolled into a quid - but
I believe that's going to be the most difficult method to get results. It's strongly dependent
on the quality of the raw product.

An alcohol based tincture that has a standardized amount of salvinorin A is going to yield
a preditcable result.

Final note - an undiluted alcohol based tincture will burn the tissues of your mouth some.
You'll generate a lot of saliva very quickly which will reduce that effect. But be prepared to
deal with 30-45 seconds of pain (sorry for reporting the bad side). You might also kill off some
tissue. The alcohol however is required for efficient absorbtion of the active ingredient.