Hi Elle
It will take some time before you can go at it fully. It's possible that Dr. Kim changes his post-op instructions per person, so please do just follow his instructions to the tee.
That said, for me he asked that I not talk for another week following the botox injection (at 1 week post op), so that was 2 weeks total no talking. Then at 4 weeks time I could have conversation as much as I wanted to, quietly, for the next month. And holy heck was I quiet. Even after 2 months I had to limit the amount I spoke because I could tell I was straining during long periods. You really have to take it easy at first. I would say my voice was at about 30% by 2 months, 60% by 3, 90% by 6, and probably at around 12 or more I was at 95.
I am still noticing improvements in my voice's durability, and I am 1.5 years post-op by now. I think most likely my vocal tremor affects matters, because I have not had any botox injections following the one immediately after the op. And, I never took the clonazepam because I do not like the idea of taking benzo's every day no matter how small the dose.
I still have to watch out for yelling too much, because my voice will be less powerful the next day if I don't- but as I said this is still becoming less and less. I talked to Dr. Kim about it several months ago, and he said it is absolutely a symptom of my preexisting focal dystonia of the larynx (vocal tremor) and recommended that I take clonazepam as a minimum... or get another botox injection. I have done neither, because it is very manageable. I find myself in lots of situations where I am talking over things using full voice power. My friends even tend to lose their voices sometimes in conditions like that.