leave it for a few days until the hygro shows at least 70%, possibly more. That'll mean that absorption by the cedar has slowed down and the humidity of the air is rising. Remove the source of humidity and let the hygro stabilize. If lower than your preferred RH, leave the water plate a day or two more. If spot on, insert cigars and favorite humidification media. If still too high (doubtful) the let it air for a while and repeat the test.