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Strategies

Chapter 2: Time Horizon & Risk Tolerance

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Chapter 2: Time Horizon & Risk Tolerance

Two questions determine your portfolio allocation: how long until you need the money, and how much loss can you bear to watch?

The first is mathematical. Time horizon—measured in years until first withdrawal, not retirement age—determines your capacity to absorb drawdowns. A 35-year-old with 30 years until first spending can survive a 50% crash because history shows 50% crashes recover in 5–7 years. A 65-year-old needing money next month cannot survive any crash; they need bonds and cash, regardless of their life expectancy. Time horizon directly determines risk capacity. Longer horizons allow higher equity allocation because longer waiting periods allow crashes to recover.

The second is psychological. Risk tolerance—your willingness to hold an allocation through crashes without panic-selling—is personal and often misunderstood. Questionnaires over-estimate tolerance by 15–30%. Investors claiming to be "aggressive" often want to reduce equity exposure after a 20% crash, contradicting their questionnaire answers. True risk tolerance is revealed during crashes, not in hypotheticals. An investor who can sleep through a 30% drawdown has genuinely different tolerance than one who can't—and the difference determines whether they'll hold their allocation or sell at the worst time.

Risk capacity and risk tolerance are separate things. An investor might have high capacity (30-year horizon) but low tolerance (anxious by nature, never lived through a crash). A mechanical 80/20 allocation that capacity allows might be 70/30 that tolerance can sustain. The lower one wins: a portfolio you'll abandon in a crash is worse than one you'll hold.

This chapter explores the full landscape: what time horizon actually means (not "when you retire," but "when you start withdrawing"), how to measure it, why it shapes allocation, what risk capacity and tolerance are separately and together, why questionnaires fail to predict behaviour, and the psychological biases that lead investors to abandon sound plans at the worst times. By the end, you'll be able to build an allocation that is mathematically sound and psychologically sustainable—the only kind of allocation that actually works over decades.

What's in this chapter​

How to read it​

Start with the first article: time horizon is often misunderstood (it's not retirement age, it's when you spend), and clearing this up prevents cascading errors throughout the rest of the chapter. Then move through the foundational concepts: what short, medium, and long horizons mean; why those boundaries exist; how horizon shapes allocation; and the distinction between risk capacity and risk tolerance.

Once you understand the framework, the next group of articles moves from theory to practice: how to measure risk tolerance (questionnaires, the sleep-at-night test, historical behaviour), the psychological biases that wreck allocations (recency bias, panic-selling), and special risks like sequence-of-returns that occur only during withdrawal phases.

Read in order. Each article builds on previous ones. By article 10, you'll have a complete mental model of why your allocation is what it is, and why holding it through a crash is the right decision—not because someone told you to, but because you understand the math and your own psychology.