How long are Kenalog Injections useful for after rhinoplasty?

What is the timing for Kenalog injections after rhinoplasty? it takes 6 to 8 weeks to build up scar tissue after a rhinoplasty. I generally begin steroid injection after approximately four months but I know of surgeons who do it in as little as one month postop and I know of others who wait at least a year. I have used steroid injection to the tip and the area above the tip called the supratip as late as 10 years after surgery with a good result. Steroid injection not only shrinks scar tissue but atrophies normal tissue as well, which is why it can have an effect even years after rhinoplasty.