Sorry for the confusion! Your teachers have unlimited uploads to TALENT.
The recording time that is shown on T Uploader is dependent on how much space is available on their phone to save the video. Videos are compressed and saved to the device, so that you can record without internet, and then upload the video when you have wifi available.
Teachers can delete old photos, videos, or apps to free up storage space. Additionally, if they have already uploaded videos to TALENT, they can delete them from the app to free up space. Hopefully this helps!