A higher-sounding recording does not always have to become shorter. Some audio tools treat pitch and duration separately, so it helps to identify which operation you are actually applying.
Read the effect’s stated purpose
Audacity’s Change Pitch documentation describes an effect that alters pitch without changing tempo. This differs from an operation that changes playback speed and consequently changes both duration and pitch.
Use a short practice copy and record the original duration. Apply a small, clearly labelled experiment, then check the duration and listen to the result. Do not use another person’s voice deceptively or present a processed example as an untouched recording.
Listen beyond the intended shift
Notice whether the sound acquires unwanted roughness or an altered character. A tool achieving the requested pitch does not guarantee that the processed result suits your purpose.
Keep the original and the experiment identifiable in the session. Your note should explain why the change was tried and whether it helped, rather than treating a successful button press as a completed production decision. Separating pitch, timing and perceived quality gives you a more precise way to discuss the edit.