Time underwater: how long it takes a portfolio to recover from drawdown
A portfolio's time underwater—sometimes called the recovery period or time to recovery—measures how long it takes to return to a previous high-water mark following a drawdown. Where maximum drawdown tells you how deep the worst loss was, time underwater tells you how long the pain lasted. For investors who need liquidity at a known horizon, or who find sustained underperformance psychologically difficult to sustain, time underwater can be as important a risk measure as drawdown depth.
What time underwater measures
Time underwater is the duration between two successive new portfolio highs—equivalently, the period during which the portfolio has not yet recovered from its most recent peak. It can be measured as:
- Calendar days from peak to new high
- Trading days from peak to new high
- Months—most common for long-run portfolio analysis
- Percentage of total history: what fraction of the full observed period the portfolio spent below its prior peak
A related measure is the maximum time underwater: the longest such period observed in the portfolio's history. This represents the single worst recovery episode an investor holding the portfolio would have had to endure.
Historical examples
Well-documented time-underwater episodes illustrate how extended recoveries can be:
- S&P 500 (2000–2013): following the March 2000 peak, the S&P 500 total return index in USD did not recover to its prior high until approximately 2007—roughly seven years—and then fell again in the financial crisis. Full recovery to the 2000 peak in nominal terms was not achieved until approximately 2013: thirteen years below the prior high.
- Nikkei 225 (1989–2024): the Nikkei peaked in December 1989. In nominal yen terms, it did not recover to that level for more than three decades.
- Diversified global portfolio: a well-diversified portfolio (e.g., 60% global equities / 40% global bonds) has historically had a maximum time underwater of approximately three to four years, substantially shorter than a pure equity allocation.
Time underwater vs drawdown depth
Time underwater and maximum drawdown are distinct but related measures that capture different dimensions of the same risk:
- A sharp crash followed by rapid recovery produces a large drawdown with short time underwater: the 2020 Covid crash saw the S&P 500 fall 34% in 23 trading days and recover within approximately five months
- A slow grinding bear market produces a moderate drawdown with extended time underwater: the 2000–2002 technology bear market was more damaging in time-underwater terms than in peak-to-trough terms for many diversified portfolios
- The psychological challenge of the two profiles differs: a sharp crash is acute; a slow grind is chronic
Limitations
- Time underwater is path-dependent and retrospective; a long historical recovery period does not predict the duration of the current drawdown
- Sensitive to currency and inflation treatment: a nominal recovery to prior highs may not represent a real (inflation-adjusted) recovery, which may take longer
- Investor-specific liquidity constraints matter: a portfolio that requires partial liquidation during the recovery period will not achieve the same time-underwater outcome as a fully held position
- The metric is only defined once a new high is reached; for a portfolio still in drawdown, time underwater is an open interval
Time underwater in pfolio
pfolio's Insights product reports drawdown in the risk section. Users can observe the current drawdown from peak (if any) and the maximum historical drawdown over the analysis period, presented as a time series that shows how each drawdown episode evolved. The metric is available for the portfolio as a whole and for individual positions, allowing users to compare drawdown characteristics across asset classes and portfolio configurations.
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