A Worked Example
A player who is comfortable spending about ₹150 on an evening's entertainment has roughly ₹5,000 of turnover to work with. At sixty rounds an hour that is a stake of around ₹80 for one hour, or ₹40 for two. Both plans cost the same in expectation; the second one lasts twice as long and swings half as hard, which is why most people prefer it once they have seen the arithmetic.
Note what is absent from that calculation: any assumption about winning. Expected cost is the price of the entertainment, and results move around it in both directions. Sessions that finish ahead are not a different plan working better; they are the same plan with luck attached.
The Simplest Version
If none of the above appeals, one rule captures most of the benefit: pick a stake, keep it identical all evening, and decide in advance how many rounds you are going to play. Everything else in bankroll management is refinement on top of those two decisions.
The arithmetic behind the three per cent figure is on the odds and house edge page, and the full list of guides is on the home page.