A Worked Example
Somebody comfortable spending about ₹150 on an evening 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 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.
The Simplest Version
Pick a stake, keep it identical all evening, and decide in advance how many rounds you will play. Everything else in bankroll management is refinement on top of those two decisions, and almost every expensive session in this category is a story about breaking one of them.
How the timer multiplies all of it is on the timer page, and every guide is listed on the home page.