if i take a sub threshold dose of 2cb say 5mg how long should wait before my second experiment ... I.m trying to better undertand what effect kick in when and find a sweet spot also what incriments should i in up in
If your 5mg dose is an allergy test then I'd wait at least 24 hours before your next experiment since sometimes bad reactions can take a long time to occur. With such a small dose this should also be enough to ward off any tolerance for your next dose, though normally with a regular dose I'd recommend a minimum of a week or two before your second.
Sorry, actually ignore my advice. I mistakenly read your post as referring to Methoxetamine and not 2C-B. Sublingual with 2C-B would be rather unpleasant.
I'd try 20mg oral next time if I were you. Wait at least a week, ideally two weeks since your previous experience, to allow for tolerance to subside.
Hope this helps. I'm editing my other post out so I don't confuse people