How long should I expect to wait for my DTV application review after submitting additional documents?

Hello - I submitted a DTV application to the Berlin embassy on the 8th of January, and received an email asking for one more document yesterday on the 20th and I uploaded the document immediately. That was 8 full working days from the time of application to receiving the request.

Having read their website I can see that apparently the clock resets back to 'up to 15 working days' for the documents I uploaded to be reviewed. I was just wondering based on others' experiences, if that is what actually happens in reality, whether it's much quicker than that, or whether I can expect to wait around the same amount of time I already have initially for my application/docs to be reviewed?

Thanks!