When to file DS-160 for K1 visa?

So, I can't seem to find any specific information about when I'm supposed to do this. Our case was just received by the embassy two days ago and we are still waiting for the instruction letter. I'm assuming they will send it to us within a week. How much time do we have to respond to packet 3 and when should we file the DS-160? Could somebody walk us through this part of the process? The embassy is Belgrade, Serbia if that helps at all

submitted by /u/mellow_yellow___
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source https://www.reddit.com/r/immigration/comments/qidppl/when_to_file_ds160_for_k1_visa/

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