The complexity of the website (e.g., eCommerce, custom applications, or simple brochure sites) effects the time required to develop a website.
Custom designs or advanced features (e.g., integration with third-party systems, payment gateways, etc.) can enhance the website.
Websites with large volumes of content or specialized content (e.g., blogs, product descriptions) may take some more time.
Ensuring that the website works across multiple devices and browsers, and user requests thorough testing.