Hello from justanswer,
I'm Dr Chaithanya attending you.
It is detected from the hair from 5 to 10 days after last consumption, but can be detected up to 90 days if taken heavily for long term.
It varies from scalp hair to body hair.
Say the armpit hair growth is less, so it can be detected little longer, say 2 weeks to 3 weeks,
Please see the below link for more details,
one of the largest drug testing programs in the world.
As you had only once, that too single dose, it will negative for you.
Please feel free to ask if any further questions. If done for now, please leave a positive rating
[Request to click on the 5th star] above the chat box so I can get credit for helping you today.
We only get credit for helping clients after positive feedback.
You can always reach me with "For Dr. Chaithanya only" in the medical or health categories.
Below link is the fastest way to reach me,
A little bonus from your side is welcome and highly appreciated!
Thanks for using JustAnswer.com