when you rescape, you have to be little bit more careful to not make a mess. But if you make a mess, it takes not longer than 12h to clear up.( Usually overnight)
I have a MTS tank with gravel and one with black diamond sand.
I noticed the tank with gravel when you rescape and the dirt is on top of the gravel, the corys clean up the mess by plying in the dirt (that way the dirt settels back in the gravel and into the water).
The sand MTS tank was just setted up and seems like the dirt stays on top of the sand when you rescape and dirt comes up, but I think this gives a nicer Natural look. I will put some corys in that tank in about 2-3 weeks (they are in QT right now) and see if they clean up the mess too.
No matter what, I love MTS/ dirt tanks, they are so easy

. But if you work with High light and co2 you have to keep up with dosing...