You can extend up to two seconds for video and ten seconds for audio.
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Generative Extend is a premium generative AI feature in Premiere that requires the use of generative credits. Premium generative AI features are more computationally intensive (currently, audio and video generative features) and are accessible through Adobe Firefly standalone plans and select Creative Cloud plans. You can try Generative Extend with a limited number of complimentary generations.
Yes, with Generative Extend you can use Adobe Firefly Video AI to seamlessly add up to 2 seconds of video, 10 seconds of audio, or 2 seconds of both video and audio.