In my opinion it would be a complete guessing game whether you are ready or not. You have to be in moderate to severe withdrawals before it's safe to take that very first dose. You DO NOT want to take ANY CHANCES of going into those precipated withdrawals like I did to myself when I first inducted.
MY doctor told me to wait 3 days and I waited only about 8 hours I believe it was. I went almost instantly into those PW's and it's like regular withdrawals X 10!!!! I thought I was going to die I was so sick. I'm NOT trying to frighten you one bit, only letting you know it's far better to wait as long as possible and be sure than to take any chance at inducting too early.
Again in my own personal opinion, but the very best method of deciding if your ready or not is to use what's called a Cow's sheet to determine your level of withdrawals. It's a chart that places a number on different symptoms at the time you are having withdrawals. I believe you need to be at around a score of 15 or higher before it's safe to induct.
Here's the link to that Cows Sheet.....http://www.naabt.org/documents/cows_ind ... _sheet.pdf
You may not have ALL the symptoms listed on the sheet, and it's probably best to have someone else score you. You will be in withdrawals at the time and it's very easy to "fudge" your score higher, or make the number go up without realizing it. Having someone score you is best.
You may be ready at 24 hours, and you may not. If you use that Cow's Sheet Score then you know for sure when you are ready. I would positively use it now every single time knowing what I know now.
How much Oxy did you take in the previous days? That could also have some bearing on how long it takes to be ready to induct.
I wish you the very best with your induction. Please let us know how it goes for you. Take care and just make sure you are really feeling bad before taking the first dose. Oh and you should probably begin with small doses of sub until you are stable. I wouldn't take any more than is needed to get you out of withdrawals at the time.
Good luck and if I can be of any further help just let me know!