Batch Tempo Change

Hello,
I have a folder with 212 sound files that need to be exactly the same length (0.8s). I am using the Change Tempo feature from Audacity, and edited a chain (> parameters > length > 0.8) in order to do it in batch since it is very time consuming. However the resulting sounds remain unchanged.
Is there anything I can do?
Thanks!
I have a folder with 212 sound files that need to be exactly the same length (0.8s). I am using the Change Tempo feature from Audacity, and edited a chain (> parameters > length > 0.8) in order to do it in batch since it is very time consuming. However the resulting sounds remain unchanged.
Is there anything I can do?
Thanks!