A 25% crash that recovers in one year costs you about 4 percentage points of long-term IRR. The same 25% crash that takes five years to recover costs you 9 percentage points. The depth was identical. The damage was twice as bad. The crash is what makes headlines. The duration is what makes wealth disappear — quietly, year after year, while a smaller base sits idle and every subsequent compounding period loses what the larger base would have produced. Depth is one moment. Duration is the sentence.
Every conversation about market corrections starts with the depth. "How much did it fall?" "Was it 20% or 30%?" "Is this the bottom?" The depth is dramatic. It is news. It is what gets reported, debated, and remembered.
But depth is recoverable. A 25% drawdown is the same number whether it lasts six months or six years. What is not the same is what those years do to your IRR. Each year spent below the prior trajectory is a year missing compounding on the base that would have existed. And that missed compounding is not a one-time loss — it cascades through every subsequent year, because every future return is now applied to a smaller base than it should have been.
The depth is what hurts in the moment. The duration is what compounds against you for the rest of the journey. Most investors are watching the wrong variable.
The cleanest way to see duration's cost is to fix everything else. Same starting corpus (₹10L). Same long-term CAGR (12%). Same crash magnitude (-25%). Same crash year (year 3 of a 10-year horizon). Vary only the recovery duration. The crash is identical in every row. The damage is not.
| Recovery Duration | Stay-Out IRR | Lost vs 12% Target | Final Wealth |
|---|---|---|---|
| 1 year (recovery in y4) | 7.6% | −4.4 pts | ₹20.8L |
| 2 years (recovery in y5) | 6.4% | −5.6 pts | ₹18.6L |
| 3 years (recovery in y6) | 5.2% | −6.8 pts | ₹16.6L |
| 4 years (recovery in y7) | 4.0% | −8.0 pts | ₹14.8L |
| 5 years (recovery in y8) | 2.8% | −9.2 pts | ₹13.2L |
| 6 years (recovery in y9) | 1.7% | −10.3 pts | ₹11.8L |
Initial corpus ₹10L, normal-year CAGR 12%, crash −25% in year 3, 10-year horizon. "Recovery duration" = years between the crash and the year normal returns resume. Each additional year of duration removes ~1.1 percentage points from long-term IRR. The crash is identical in every row. The damage is not.
A near-linear relationship: each additional year of recovery duration costs roughly 1.1 percentage points of long-term IRR. The damage compounds because every subsequent compounding period operates on a smaller base than it would have on the original trajectory.
History supplies natural experiments. Crashes of similar magnitude have produced wildly different recovery durations — and wildly different long-term consequences for the investors who lived through them.
| Episode | Peak Drawdown | Recovery Duration | Years to Prior Peak | Tier |
|---|---|---|---|---|
| Nifty COVID 2020 | −38% | ~9 months | <1 year | Light |
| S&P 500 COVID 2020 | −34% | ~5 months | <1 year | Light |
| Nifty 2008–09 GFC | −52% | ~18 months | ~3 years | Moderate |
| S&P 500 2008–09 GFC | −57% | ~24 months | ~5 years | Moderate |
| S&P 500 Dot-Com 2000–02 | −49% | ~30 months | ~7 years | Heavy |
| Dow 1929–32 Depression | −89% | ~30+ years | ~25 years | Generational |
| Nikkei 1989–present | −82% | ~34 years & counting | ~34 years | Generational |
"Recovery duration" = trough-to-prior-peak. The 2020 COVID crashes were deep but their durations were short, so their long-term IRR damage was limited. The 2000 dot-com was a similar depth (-49%) but its 7-year recovery did far more lifetime damage to compounders. The 1929 and 1989 episodes are the limiting cases of duration as the dominant variable.
The cognitive distortion is built into how markets are reported. Every percentage point of fall is a headline. Every day of drawdown gets a number. The depth is loud.
But the duration that follows is silent. Nobody runs a chyron that says "the market is still 10% below its peak after four years." Nobody headlines the slow, unspectacular years between trough and recovery. The investor who exited during the crash and is now waiting for "clarity" has no daily reminder that they are losing wealth every quiet month they remain absent. The duration tax accrues invisibly.
The investor watches depth with their eyes. The duration eats them anyway.
Four NLE calculators let you see the duration tax for your own assumptions, and the actions that compound through it.
"A crash is a moment. A recovery is a sentence. The depth is what you read in the news. The duration is what you live in your portfolio. A 25% fall recovered in one year costs your 12% target maybe four points. The same fall recovered in five years costs you nine. The crash was identical. The damage was twice as bad. Time is the variable that compounds opposition. Depth is one number. Duration is twelve. Watch the calendar. The chart is lying about which variable matters."