So I thought I would come back and post my experience with starting the subs today. I ended up doing a bunch of OC yesterday, right up until about 10 at night. then i stayed up super late, without taking anymore. I thought being awake vs sleeping would encourage the onset of withdrawals. slept, finally, woke up, went off to doctor.
I had a terrible stomach ache and was very restless, felt some sweats come and go, very minor. I was worried that I wasn't far enough into W/D and that he would send me home. He actually gave me a paper to read that said as much, that if he didn't think i was far enough in, he would reschedule for another day. but he assessed me on his scale. I came up at 16. he said to wait a while, see if I got to 20. about 45 minutes later, i scored 21 and he started the therapy.
so there it is. if anyone has a similar experience or question about how long you have to go before starting the therapy...there is one answer.