All UGC deliverables look different. Typically though, they will share a script, a visual/audio/text hook, visuals (focusing on the item or service), a call-to-action, and an interactive content (a question, feedback, reviews, etc.).

Personally, I create 2-4 versions of the same UGC ad with various hooks, text, audio, and edits to diverse quality content all around across all platforms. My turnaround time is usually 1-2 days maximum, depending on the request.