@IT aviator
After you appear for your GD, you will receive the results for the same the next day and if you clear it,you will have to appear for the interview the next day...ie there will be a gap of one day between GD and PI...
You will receive the results for the PI a week after all the interviews are over...then u will start getting calls for sim check which takes a while(could be even one and a half month later)...sim checks results are dispatched in a week's time...
And after all that done you will get the call for medicals 10days before your training batch has to start...
That's what happened last time...Also try n refer to last year's forum...its quite informative..