> For the complete documentation index, see [llms.txt](https://docs.enercalc.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.enercalc.com/efr-faq/installation-and-learning/how-long-does-the-installation-take.md). # Installation Time How long does the installation take? The entire installation process should take roughly 2 minutes or less. You can install the most current build of ENERCALC on the same computer as any existing older builds of ENERCALC (specifically, SEL 6.\*, 10.\* and 12.\*). This will not disrupt access to existing `.EC6` project files. Depending on the speed of your computer, this installation typically takes 60 to 90 seconds. The Revit add-in portion of the ENERCALC installation will provide the Revit-based ribbon bar used to access ENERCALC functionality. The applicable version of Revit must be closed prior to install and reopened after the installation completes. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://docs.enercalc.com/efr-faq/installation-and-learning/how-long-does-the-installation-take.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.