Many factors can contribute to that.
1. The quality of the paint used is of the utmost importance.
2. The amount of nearby trees and shrubbery and whether or not you have an automatic sprinkler system that keeps the house or nearby greenery constantly damp or moist..
3. Window unit air conditioners are a major source of rotted window sills and peeling paint around the window frames and siding below.
There are too many factors to take into consideration here, and each home can be different. However a good quality job done by a professional crew under normal conditions should last anywhere from 4-7 years. Call us and we will be happy to evaluate your particular situation and offer you a more precise answer.