I had a similar problem with a guest who made a reservation for a month.
Usually airbnb does the payout 24 hr After checkin and I never worried about.
This time I checked 1 , 2 , 3 days and NADA .
so I called C.S. and they said that everything is fine but there is a problem with a small amout. that they contact the guest and everything will be fine.
It was the end of the month so i paiedy bills, and the bank statement showed red.
I kept calling them several times a day and finally the payout was made 1 week after the original date.