How soon does the sanity check look like working fine?

[Kyubyong]

I'm running the capgen.py, but the results of the sanity check don't look meaningful. Basically, the five generated captions for each image are all null or "a". How soon can I see if it works? I just want it to show any random words, not null or 'a'. Or do I have to be patient and wait for a few hours until it generates meaningful captions?