Testing with my own data

[sallyjoy]

Hi,
I am implementing your code on Google Colaboratory.
For testing, I am running " train.py " with 12 wavs files (total 1 minute).
After displaying the message "START a new training", and running for about 1 hour, nothing happened. No error showed, no checkpoint is created in the folder named "model_new".
Is it because my data is too low?
Is there a minimum duration of data required ?
After how much time of execution a checkpoint is created?