The tricky part is OD, while subs cannot cause an fatal OD, taking enough other opiates could cause and OD before one feels their effects on the brain. With the
long half life of sub, one day is not
long enough to detox the accumulation of the
last few weeks of bupe. I don't think precipitated withdrawal would be possible in such a short time. Just my opinion of coarse. What I really think is, use the sub to form a plan and get on that plan.