How fast does benlysta work?

Hi, my dad has been diagnosed with lupus (SLE) 5 years ago, but probably had it for far longer since it took quite some time and money to get all the tests done and confirm this diagnosis. He’s been on steroids for the whole time, on and off, since he was gaining too much weight while on them that it became dangerous for his heart. He became almost diabetic. Stopping steroids did help, but as our rheumatologist told us, there’s little else he could do. For our appointment last month my dad had a very bad flare up and rheumatologist suggested he tries benlysta infusions. Luckily our insurance covers them since they are the fairly new treatment and dad has received two infusions so far, there is coming up next week after which he’ll receive them monthly. But so far, we’re bot a bit disappointed since there really are no obvious signs things are getting better.