was lookin at wikipedia and that says it shows up between 3-7 days after use... If you had to estimate though, would it be a yes/no???
Because getting/keeping a job is of utmost importance, I dont waste time with guesstimations or cleanup timetables, especially from 'encyclopedia sites' in which any Tom or Harry can post, modify, and edit. Test yourself with a home THC test if you really think this job is important to you.

Get some niacin and sweat it out or check out a smoke shop. They have all kinds of drinks and aids to help pass a piss test.
Niacin is a myth. It does nothing to rid the body of THC. Sweating doesnt help much because very little THC is excreted via sweat. The rest is being excreted via the urine and bowels.
Detox products are a big scam. They are an overpriced way of accomplishing the same thing that can be accomplished for $$$ less by following the guidelines outlined in the Dilution sticky thread.

See, I've seen loads of different things around the place. Some places have said that the test would only show up positive, if you had smoked within a week to 10 days, while lots of others have said a month etc.
Perhaps the conflicting information youve encountered should be reason enough for you to home test yourself, so youd know for sure. Its only logical.

Anyways, what are the chances of my company doing a drugs test on me... There based in France and it's a 6 month contract???
What does your company policy state?

And btw, if I do fail, would being in the room with people who smoke be a genuine excuse?
No it wouldnt. You cannot test positive on the basis of secondhand smoke.