How much cash on hand should I set aside for a 203k rehab loan/fha loan?

We are considering at a house that we really love that needs some minor work to pass the fha inspection. The cost of the home is 57k and we don t expect more than 15k worst case scenario in repairs. We want to try to get a 203k rehab loan for this.
We are also ready to book our flight for our honeymoon and are getting married in less than 3 months! How much should we expect to set aside in addition to the 3.5k down payment?

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