This is just time study and not the price target/ level study.
Considering Nifty weekly chart , Aug 2013 is main starting Anchor point I have considered:
Following are longer time observation
Aug 2013 (low) - March 2015 (high) - 79 bars (i.e weeks)
March 2015 (high) - September 2016 (high) - 79 bars
Sep 2016 (high) - 12-19 March 2018 (My assumption , New All time high) - 79 bars
Following are shorter time observation
Feb 2016 (low) - September 2016 (high) 27 bars
Feb 2016 (low) - December 2016 (low ) 27 x1.61 = 43 bars
Feb 2016 (low) - june/july 2017 (low , My assumption ) 27 x 2.61 = 70 bars
Following are very shorter time observation
September 2016 (high) - December 2016 (low ) 16 bars
December 2016 (low ) - March 2017 (high , My assumption) 16 X 0.61 = 10 bars
December 2016 (low ) - June /july 2017 ( low , My assumption) 16 X 1.61 = 26 bars
Please Note : The future time projections low /high which I have mentioned are my assumption. So it can be wrong.
Disclaimer : This not advise for investing ,Consult your financial adviser before investing.
Elliot wave theory and GANN methods seems to incorporate time and price study .
There are lot of books on fibonnaci series and technical analysis.for e.g Bryce Gilmore, Constance Brown , Robert Fischer .
I havent check them out so wont be able to comment which would be gr8 , My take check all :-)