# Durations and resolution Use 9:16 for TikTok, Instagram Reels, YouTube Shorts, and most mobile-first ads. Use 16:9 for landscape placements and presentations. Use 1:1 for square social placements and some static ads. Keep generated scenes short. Most scene-level video generations work best as 3 to 15 second clips depending on the model. A full ad is usually assembled from multiple shorter scenes rather than one long generation. Use higher resolution for final, high-value assets when available. Use lower or faster settings for early concept testing. Always check model-specific duration and resolution options in the UI. --- # Agent Instructions: 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: ``` GET https://docs.avastudio.com/models-and-credits/durations-and-resolution.md?ask= ``` The question should be specific, self-contained, and written in natural language. 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.