I am confused about sade sati?!

I am confused about sade sati?

My DOB 20-09-1979
Place of birth uttaranchal
time 8:15pm

So, i am having sade sati period in my raashi. How long will it take to leave me.

Your Raashi is 'Singh'.Sadesati is defined as the period of seven and half years during which saturn transits over the sign immediately before your raashi,the raashi itself and the sign after your raashi.The period comes to seven and half years since saturn takes two and half years to transit over each sign.The sign before your raashi is 'Kark' and the sign after your raashi is 'Kanya'.
Saturn is presently transiting over 'Kark' the sign before ur Raashi.Thus it is correct to say that u r passing through sadesati.However saturn's transit over 'Kark' is going to be over soon and it will then come to ur Raashi 'Singh'.After staying in 'Singh' for two and half years saturn will then transit to Kanya the next Raashi.It is only when saturn leaves 'Kanya' that your sadesati will be over.So you have to wait for approximately another five years before it is over,The exact date on which ur sade sati will be over is 15th November 2011.
This is all for your information.Please do not be perturbed about your sadesati.Many unscruplous professional astrologers at times tell some high sounding negative results of sade sati with the aim of frightening the client and extract more money.Hope you have/are not taken in by anything like that.Saturn takes 30 years to complete a revolution of the zodiac(which consists of 12 signs) and thus sadesati comes in the lifetime of every person two to three times.Sade sati is therefore a routine.The direct result of sadesati is just a feeling of loneliness,dark thoughts or may be a feeling of depression;nothing more.These results are not felt throughout the period of seven and half years,but only during a very small portion of this time period.If the simultaneous transit of Jupiter is good as also the Mahadasha/Antardasha one may get good results like even promotion and gain of money inspite of the sadesati,besides the above negative results.It is when the transit of jupiter and Mahadasha/Antardasha are bad besides the Sadesati,then only the results may be bad.And as mentioned in some other answer,the suffering if any given by Saturn is with a view to teach you,purify you from within and if you take the things in the correct perspective may be even to heal you.
Hope you have understood the above.If you have,i am sure you will deal with the sadesati effectively.