You are going to hate this answer, but it is hard to say. You could dance for a few days and be back to where you were or you could dance for months. I have experienced both lengths of time and I know the feeling.

The best thing to do is wait it out and continue adding new content and backlinking as normal.

Good luck!

It can take around week.

What backlinking methods have been used?

Make sure you VARY anchor texts - this has been so far #1 factor for me why my site's dance.

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Fluctuations in ranks are normal to happen and nearly all websites experience the ups and downs in web positions and usually there is nothing to worry about. Two issues seem to be very important in here, the age of your domain and the links which point at it. Naturally, for a website which has been online for only one month, even huge changes in daily stats would be considered as normal. In competitive niches even one year old domains may not be immune from dances online.

It is recommended that you keep building links for your website, just make sure they remain online because ages of links too can be among very important issues always and directly affecting how web positions get fixed online. The next thing is adding some good content pages to your website and the third idea is simply being patient because trust in the cyber world is gained in the course of time and you need to wait and gradually your web placements will tend to become stable.

From my experience, it took 3 weeks.