as I can do it in a month.
This. The frustration is infuriating. It feels like everything has to be put on hold, which is like going backwards.
Quicker, for dbt, doesn't mean better. The concepts are ones that take work to understand, but it also just takes time (frustrating, pull your hair out, please don't make me stop my progress time) for the confepts to actually become a natural part of the way you cope day to day, and the homework and feedback you get during a good dbt course is a really big part of the process.
Can you talk to others who have done the course, or to the facilitator about the process and expectations and outcomes? With that kind of pricetag, it's an investment in your health and future, so reassuring yourself it's a worthwhile investment is pretty reasonable.
But the time factor? For me, it was just a case of bite the bullet, not much choice. If you weigh up the amount of time you've been living with SI, and how that's become your brain's habitual go-to solution when you're struggling, one month just isn't going to turn that around and teach you new skills AND get you to the point where you're incorporating them fairly naturally and successfully. Even now, my brain goes back to the "suicide solution" when things are really bad. But I can manage it in a way that it's like a rash that comes and goes, and my ability to be aware of it, and coexist with it with life still being worthwhile is so far removed from where I used to be.
The time out of therapy? Man do I understand your frustration. It's so much more important that it's a good course run by a competent facilitator though. Dealing with something as intense as SI, for so many years, there is no quick fix, and 6 months is a realistic timeframe.
Maybe it's just not for you. Maybe the other programs are more up your alley. Maybe. But when you consider how many years you've been fighting this demon, and someone is saying, potentially, I can show you how to get rid of this demon, for good, if you'll give me 6 months of your time...
For me, like I said, I've made up the time out that I had to stop therapy to do dbt many times over. I'm not in and out of hospital anymore - hospital is the rare exception. Rewind 5 years, I basically spent 30-50% of my life, year after year, in hospital. You bet that's worth 6 months of feeling like you're standing still!