Plaster drying times vary by type, thickness, and environmental conditions, but here’s a practical, general guide to help you plan. Direct answer

• Typical base coat or skim coat on interior walls: about 3 to 7 days to feel dry to the touch, with full cure taking longer.
• For plasterboard installations with multiple layers: around 1 to 2 weeks before painting, depending on thickness and humidity.
• Heavier or multi-layer plaster (hardwall, bonding, or multi-finish on solid backing): roughly 5 to 14 days, sometimes longer in damp or cold conditions.
• In very humid or poorly ventilated spaces, drying times can extend by 1–2 weeks; in hot, dry environments, plaster may dry faster but cure times remain longer for full strength.

Practical checks to know when it’s ready to decorate

• Visual cue: the plaster should turn pale pink (or a uniform light color) across the entire surface, with no dark damp patches.
• Feel: the surface should feel dry to the touch and not give off a cold or damp sensation.
• Odor: there should be no noticeable damp or musty smell.
• If unsure, wait longer and test a small area—some projects require a full 1–2 week window even after the surface looks dry.

Tips to improve drying time

• Maintain moderate warmth (roughly 18–21°C / 64–70°F) and good airflow.
• Use dehumidifiers in damp spaces and ensure adequate ventilation during and after plastering.
• Avoid sealing the room with paints or finishes until the plaster is fully dry and cured.

If you can share the exact plaster type (e.g., one-coat, browning, bonding, hardwall, multi-finish) and the thickness of each layer, plus your room conditions (temperature, humidity, ventilation), a more precise timeframe can be estimated.