You can adjust the length of the entire timeline itself for all of your banners by clicking on the Timeline select box in the Bannerify header; selecting a length (with options from 3 seconds to 3 minutes) will automatically extend or shrink the Bannerify timeline for all of your banners. Bannerify will do its best to update your existing animations if they previously extended beyond a new shorter timeline, and vice-versa.

Keeping your timeline length when copy/pasting banners. If you need to copy/paste banners onto a new page in the same Figma file, keep Bannerify open, create the new page, and then paste your banners there. Bannerify will automatically copy your current page's timeline and export settings onto brand new pages while the plugin is running. If you paste into a completely separate Figma file, Figma may not carry over those page-level Bannerify settings, so you may need to set the timeline length again in the new file.

You can't automatically undo timeline length updates. Selecting a new timeline length will apply the changes to the timelines across all of your banners. You will need to manually update your timeline animations again if you change your mind. With this in mind, it's usually worth setting your timeline length before starting to work on your animations.