If possible; try pulling up the trim closest to the area and see if you can lift up a section of the floor. Just a little bit is all you need to get some circulation and air moving under the floor. Use a fan to get a head start on the process.
If that is not possible, then maybe a dehumidifier running for a couple of days will draw out the moisture and help with the drying out process.
A last resort is to cut out one plank in the center of the area and some how piece in a new one after the moisture is gone. Yes you will have to ruin that initial plank, but if you have even a couple of pieces you should be able to "puzzle" it back in.
Let us know how its going.