You can use small bits that are up to 3/8 inch in diameter, or larger bits that are 1/2 inch or more in diameter. Make sure the bits you use are coated with carbide or diamond; this information is usually visible on the package. You can also use hole saw bits to drill into stucco.

The curing time for stucco typically takes several weeks to fully complete. During the curing process, the stucco undergoes a chemical reaction and gradually hardens. It's important to note that curing is different from drying. While the surface of the stucco may dry relatively quickly within a few hours or days, the curing process continues beneath the surface, strengthening and solidifying the stucco. 

It's best to avoid excessive moisture exposure during the curing period, as it can impede the curing process. The exact curing time can vary based on factors such as temperature, humidity, and the specific stucco mixture used.

One of the most significant downsides to stucco is the installation cost, which is higher than that of many other siding options because getting it to look clean and professional is a labor-intensive process. Stucco can also absorb water, making it an unsuitable option for siding in areas that see excessive rainfall. Finally, stucco can crack and chip, especially in extreme weather, and repairs are not only challenging and require help from a professional who does stucco, but can get expensive.

Properly installed and maintained stucco can last 50 to 100 years, making it one of the longest-lasting siding materials available. This durable material is known for its durability, and as long as you clean and waterproof it regularly and promptly repair any damage, it’ll protect your home for decades to come.