Dry-to-touch means the surface feels dry to a light finger press (usually 30–60 min for latex). Dust won't stick, but the film is soft. Irrelevant for recoating.
Dry-to-recoat (often labeled "recoat time") is the only spec that matters for a second coat. It means the solvent has flashed off enough that a new coat won't lift, wrinkle, or trap solvent. For latex: typically 2–4 hrs @ 70 °F/50 % RH. For oil/alkyd: 8–24 hrs. Follow this number.
Full cure (7–30 days) is when the film reaches maximum hardness, chemical resistance, and washability. You can live in the room, but don't scrub, tape, or place heavy objects until then.
Rule of thumb: If the can says "recoat 4 hours," wait 4 hours minimum. Longer in cold/humid conditions. Recoating too early causes adhesion failure, flashing, or "alligatoring."