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Drywall can get wet and dry out without sustaining permanent damage, but only if the water damage is minor. If you have a small leak and are quick to correct the issue and set up blower fans and dehumidifiers, your drywall should dry out. If the leak is persistent, the drywall becomes totally waterlogged, or mold begins forming on the drywall, you should remove and replace it.

In framing, studs are placed at 16-inch intervals to coincide with the typical spacing of wall materials such as drywall or plywood. This spacing is called "on-center" and is necessary for maintaining structural stability and efficient use of materials. The 16-inch spacing also helps to distribute the weight evenly across the building's structure. For those looking to cut material costs and improve energy efficiency, 24-inch stud spacing can be employed through a method called "advanced framing". This requires careful planning and adherence to local building codes to ensure structural integrity.

You should wait at least 24 hours between each coat of drywall mud before sanding and adding another coat. This ensures the mud dries completely, although drying time depends on temperature, humidity, and the type of compound used. Lightweight muds dry faster, while heavier all-purpose compounds take longer. Always check for firmness and dryness before sanding or applying the next layer.

Level 4 is the most commonly used drywall finish for visible interior walls. Finishing the drywall to Level 4 rovides a smooth surface ready to be painted with flat paint. 

Level 2 and 3 finishing are also common, particularly on walls that will get covered.