DBT helps a lot of disorders; not just BPD. The full programs last a long time. Some are modified programs that aren't as long... maybe a couple months. And then there's some group therapies where it's not class like, but it does teach you the skills. And finally, there are Ts who simply use DBT skills as part of their therapy. I have done all except the full program. I found that the skills do help. I liked it a lot better than CBT.