How long does Mr Color Levelling Thinner take to stop smelling?

I've got a 3D printed project, and went over it with a couple of airbrushed coats of a 50/50 mix of Tamiya X-35 (their alcohol-based acrylic semi-gloss) and Mr Color Levelling Thinner. As far as I can tell, it looks good so far, but now the room next to the one I sprayed in smells of solvent a few hours later, despite extractor fans running. I knew the lacquer thinner was nasty, so bought a respirator, and haven't been in the room with the model without it (hence only knowing that the next room stinks), but would like to know when I won't need it anymore. The best I've been able to find with Google is the ten-minute touch-dry time, but I'm assuming the VOCs will take longer to be entirely gone.