How long does marijuana stay in your system for hair folicle test?

How long does marijuana stay in your system for hair folicle test?
A standard hair follicle screen covers a period of approximately 90 days, but is susceptible to time variation depending on the growth rate of your hair. The hair sample is cut as close to the scalp as possible and the most recent 3.9cm (or 1.5 inches) are tested.
It is possible to go back even further than 90 days since the time period is limited only by the length of the hair sample, but is standardized to a 90 day history.
if i remember correctly, hair folicle tests can determine as far back as 10 years.
I think for about 30 days but you could check some web sites to get a better idea. Guess you got a job thats going to test you.
I was told by a drug screener that it could show as far back as 60 days or more, it depends...