That will never be 100% certain, I'm afraid. You will be too worn down to see it if/when it appears. I said never - I never say never... It's unlikely that you'll see it.
My advice is don't do this. Don't make absolute promises like this, because it's like dropping a wall down inside yourself; a thing you can't cross. It divides you, and disallows certain connections to be made in your mind. This will be bad for you later on if left in place - and I've not really had much experience of breaking my own: you will need someone who understands as we do, to delve deep within you and ask you that one question that knocks on the 'magic' (loose) brick. Then it will fall. In my experience, I've never seen a wall that wasn't harmful to someone.
I'm sorry to be so contradictory. I don't believe this is the end yet - it doesn't sound like you've managed to explain enough, and that post sounded like it was written in the 'heat of the moment' a bit. You should both understand the reasoning behind what you're doing, or it will be wasted effort. You still love the person lying there underneath the drugs - at least if your path still lies similar to mine then I'd bet money that you do. That person will only come out if you don't destroy her by running at some predetermined time: you've probably been feeling that it's slightly easier than the hardest possible path*. Go when it feels right. You have done some preparation for this already, but not enough. The forefront, conscious part of our minds is not good at making decisions such as this: I'd leave it to your subconscious to decide when it's right, but you must listen to it and not leave it aside thinking it's a glitch. It won't be long by the sounds of it, but remember to give her wonder and awe, and give her the power to believe that what she wants from life it is possible (for her specifically) to get.
Try to remember, how it felt when you met her. That meeting will never happen again: all future events are influenced by the past, so are automatically different. However, something as good or better can happen again. She is the person you want - don't let that slip away out of frustration. Help her, and you help yourself. You sound ready to retract and get your life back, and maybe she is too. What she hasn't got is preparation for the split. Ideally she would understand that it is just separation: not a proper break-up. And it's not through lack of love - that one's easy to prove. Try having a think about the situation turned on its head: if you were her, what would you really need your lover to say/do now? If she was you, what would she do? That's helped me a lot in the past.
Best,
Fuzzy
PS This was a bit of a messy post - I'm not entirely clear what I should've done in my relationship, so passing on clues by explaining what happened-type things is all I can offer now. Hopefully you can gleen some information out of it that helps you.
* I've found that the hardest possible path is almost always the best one to follow... Especially in a relationship like yours. It's less painful in the long run if you take on the pain as and when it appears.