4/5 days is probably not correct. You will want to dry hop some time after fermentation is completed. Do Not give anything a stir after it is in the fermenter.
Do you have a hydrometer? If so, take a gravity reading after the krausen (yeast froth) has ceased. Write that gravity reading down. The next day check the gravity again. If they are the same, then it will be okay to dry hop. (Some suggest 3 days in a row for the same gravity readings)