When do the thoughts go away

They don’t. Your goal is to have them without them bothering you.

They do !!! when you stop caring because you don’t know if it’s for sure going to happen so there’s no reason to be worried

Well, I don't do compulsions for my Harm OCD anymore and the intrusions barely scare me anymore, they most of the time are just annoying, but nonetheless they still pop up. Some might stop having intrusions all together, others - me included - still get them, even after ERPing the sheet out of them. Telling someone, that they will go away is not helpful, as you can't know, if it will be the case for them, or not.

As long as it takes you to start effectively practicing ERP. Then you will be able to allow them to pass.

The biggest thing that has helped me is accepting that OCD and anxiety will always exist. EVERYONE has anxiety in their life. Everyone also gets intrusive thoughts. If I accept that I may have anxiety and will be okay… then I can move on with my day, even if I’m anxious (which typically quickly fades). Intrusive thoughts do not go away. Obsessions can fade when compulsions are stopped. I think you might be referring to the obsession part of it…?