The time it takes to build a website or web application can vary greatly depending on factors such as the complexity of the project, the features and functionality required, and the expertise of the development team. Simple websites with basic functionality can generally be completed in a few weeks while more complex projects, including e-commerce platforms or web applications with extensive features, can take several months or longer. Timelines can also be affected by factors like client feedback, revisions, and additional requirements that may arise during the development process.