It takes roughly two to four months to grow a Viking beard, depending on the length and thickness of the beard you are aiming for. If you are growing your beard out for the first time, expect it to take on the longer end of that timeline. Once you have a full grown Viking beard, you will need to put in some effort to keep it looking its best. Be sure to shampoo and condition your beard regularly, using products specifically designed for beards. You should also brush your beard daily, using a soft bristled brush or comb. Trimming and shaping your Viking beard is also important, so visit a barber or stylist who specializes in beards every few weeks.