How long should silvadene be used on a 2nd to 3rd degree burn on my forarm and hand, from a wood burning stove? Also, should it be once or twice a day, and have a dressing on it continuously? I am 62 yrs old, female, and I accidently fell into the stove while moving the wood around. I also have medical knowledge, have been a nurse for over 30 yrs now.