The timeline for custom web development varies depending on the complexity and scope of the project. Simple websites can be developed within a few weeks, while more complex web applications may take several months. Factors that can impact the timeline include the size of the website, the number of features and functionalities required, the availability of resources, the complexity of integrations, and the efficiency of the development process. Effective communication, clear project requirements, and collaboration between the development team and the business stakeholders are essential to ensure timely delivery of a custom web development project.