how long is a piece of string?
yr age/sex/metabolism/ethnicity/tolerance/health are all factors.
CWE is effective, at even 150mg levels (5x 30mg)...
Blitz or crush the pills to powder, add warm water, then leave to settle in the fridge overnight. In the morning u will see the white paracetamol filled bottom as it gradually becomes clearer near the top. Poor off the liquid, and try not to get any powder in yr drinking dose. U will know the codeine is saturated if the mixture tastes very bitter. I've grown to love it... but... (big but) I have had too much, which scared me, because I was sure I'd taken fatal doses of paracetamol. I'm still alive today - so apparently I didn't, but I only do it maybe once or twice a year now.