Stucco over wood can last for a very long time if it is properly taken care of. However, if it is not maintained and allowed to weather, it will only last for a few years. Stucco is a material that is made from cement, sand, and water mixed together. It is then applied to a surface, typically wood, in order to create a smooth finish. Once it dries, stucco is very hard and durable.
One of the reasons why stucco over wood can last for such a long time is because stucco is not porous. This means that water cannot penetrate through it and cause damage to the wood underneath. In addition, stucco contains chemicals that resist mold and mildew growth. However, if the stucco cracks or chips, water can seep in and cause problems.
Another reason why stucco over wood can have a long lifespan is because it does not require much maintenance. Once every few years, you may need to patch up any cracks or chips and reapply paint or sealant. Otherwise, simply sweeping away dirt and debris as needed will suffice. If you live in an area with high humidity or lots of rain, you may need to do this more often though.
In short, with proper care and maintenance, stucco over wood can last for many years without issue.