Yeah. Datura can last from days to weeks, and synthetic scopolamine analogues used in government tests had effects surpassing a week's time. It's far more subtle, if used correctly, but is more closely related to dramamine and benadryl than any psychedelics.
Salvia is fucked. I mean, really fucked. The Diviner's Sage, as it's known, has some value and was originally consumed by chewing/sublingual administration, giving the plant a longer lasting but far less strong effect. Smoking it out of a bong w/ a torch is a modern way of administration. Salvia's crack, if you will. The worst part about it is it's just used as a toy or a 'high'. The effects are widely considered unpleasant but it is a way to delve deep into your mind and the world around you. I've had many overwhelming experiences with it, none of which were anywhere close to being fun.
It's not for the novice psychonaut, that's for sure.