It typically takes around 30 to 60 minutes for a window pro to replace one window in standard siding types, but a window in stucco will likely take a bit longer because of the density of materials. Custom architectural windows usually require a longer replacement process because of the additional fitting and securing required.

Failing to repair damaged stucco can lead to significant problems. Cracks can grow and deepen, allowing water and moisture to get behind the stucco. This moisture intrusion can cause water damage, structural issues, and mold or mildew growth. Delaying repairs will likely cost more in the long run as the damage worsens, so it's best to repair your stucco as soon as you notice any signs of damage, such as cracks, holes, or discoloration.

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.

The best adhesive that works on stucco is usually a product specified for use on stucco or concrete surfaces. The adhesive will need to be strong to grip the stucco, but should also wipe away clean when used in a temporary application. You can also consider using super glue or hot glue on stucco.