Which two methods can be used to change the duration of a composition?

Adjusting the duration of a composition in Adobe After Effects can be effectively accomplished through the first method, which involves opening the composition settings and adjusting the duration directly, as well as using the "Trim Comp to Work Area" function.

When you open the composition settings, you have direct control over the duration of the composition, allowing you to specify an exact time length that fits your project's needs. This is a fundamental feature that ensures that your composition precisely matches the desired output duration. On the other hand, using "Trim Comp to Work Area" allows you to take the marked area of your timeline (the work area) and set the composition's duration to this section; this is especially useful when you want to focus only on a specific part of your layers or animations.

The other options involve methods that do not fundamentally adjust the duration of the overall composition itself. Changing layer duration affects individual media items within the composition but does not influence the composition's overall length. Setting keyframes and adjusting playback speed can change how content is animated and perceived, yet they do not alter the actual duration of the composition. Finally, modifying global duration settings in Preferences is not the proper approach for changing the length of a single composition, as this affects project-wide settings rather than