Short, Medium, Long Horizon Defined
Short, Medium, Long Horizon Defined
The boundary between a 2-year and 3-year horizon looks arbitrary until you account for equity volatility and recovery time. Then it becomes clear.
Key takeaways
- Short horizon (under 3 years): Equity drawdowns are often unrecovered by the time you need the money. Cash and bonds only.
- Medium horizon (3–10 years): Equities can deliver returns without the certainty of recovery, but downside is meaningful. A 50/50 mix is reasonable.
- Long horizon (10+ years): Equities have recovered historically from every bear market within 10 years. 80–100% stock is typical.
- These boundaries are empirical, not arbitrary—rooted in volatility and historical drawdown recovery times.
- Your portfolio should be segmented by horizon, not treated as a uniform allocation.
The short horizon: under 3 years
When your timeline is under three years, you cannot absorb a stock market crash. This isn't conservative; it's mathematical.
The largest stock market drawdowns in the past 50 years:
- 2008: FTSE 100 fell 48% (trough to recovery took 4 years, 7 months)
- 2000–2002: FTSE 100 fell 47% (recovery took 8 years, 2 months)
- 2020: FTSE 100 fell 35% (recovery took 9 months)
- 2022: FTSE 100 fell 26% (recovery took 14 months)
In 2008, a £100,000 portfolio in equities fell to £52,000. If you needed that money three years later (2011), you were withdrawing £52,000 instead of £100,000—a permanent 48% loss.
Conversely, a portfolio in 6-month gilts in 2008 held its value. When the crash bottomed in March 2009, the "boring" portfolio was intact and ready to buy equities at bargain prices.
For a three-year horizon, the risk of an untimely crash is too high. Your allocation should be 0% equities, 100% safe assets (cash, short-dated gilts, high-grade bonds, money market funds).
This isn't weakness. A surgeon approaching a house purchase in 18 months holds 100% cash. A retiree needing living expenses in 8 months holds 100% cash for that portion. The time horizon determines the asset class.
The medium horizon: 3–10 years
At 3–10 years, equities probably recover—but "probably" isn't certainty, and the timing is uncertain.
Take 2008 again: if you had a 10-year horizon and invested in March 2009, you recovered fully by 2013 and went on to substantial gains. But if your 10-year clock started in March 2008, you didn't fully recover until March 2012—and then had three years left to compound. Less attractive than if you'd started in 2009.
Over this medium horizon, a diversified equity portfolio (say, global stocks) has delivered positive returns about 90% of the time in rolling 5-year periods. But in the other 10% of 5-year periods, you lost money. Over 7-year rolling periods, the track record improves; over 10-year rolling periods, it's nearly unbroken positive—but "nearly" leaves room for bad luck.
The medium-horizon allocation typically includes both equities and bonds:
- Stock-heavy (6–10 years): 70–80% equities, 20–30% bonds/cash.
- Balanced (5–7 years): 60–70% equities, 30–40% bonds/cash.
- Conservative (3–5 years): 40–50% equities, 50–60% bonds/cash.
Within this range, the exact split depends on your sleep-at-night tolerance (explored later). A 50/50 split is a reasonable middle ground: in a typical year, the equity portion drives growth; in crash years, the bond portion cushions the blow.
The "3–10 year" boundary isn't fixed. A particularly aggressive investor with strong cash reserves might run 70/30 at five years. A nervous investor might shift to 40/60 at seven years. But the principle holds: equities are included for growth, bonds for stability.
The long horizon: 10+ years
Once you're 10+ years from spending, the historical case for a high equity allocation is compelling.
From 1926 to 2024:
- 1-year rolling returns for global stocks: positive 70% of the time.
- 5-year rolling returns: positive 88% of the time.
- 10-year rolling returns: positive 97% of the time (only one losing decade out of 99).
- 20-year rolling returns: positive 100% of the time (no losing 20-year periods in recorded history).
The single decade with negative 10-year returns was 1929–1939 (Great Depression). The negative 5-year period ending in 1982 saw inflation at 20%, real returns negative, but nominal gains once inflation ceased.
With a 10+ year horizon, a portfolio that is 80–100% equities is historically appropriate for someone comfortable with the volatility. The math is straightforward: equities have paid off over every genuine 10-year period, volatility is eventual background noise, and bonds are a drag on returns over this timeframe.
For someone with a 30-year horizon (age 35, first withdrawal at 65), 90–100% stocks is reasonable, even conservative. The portfolio will crash repeatedly—2020, 2022, someday 2030-something. Each time, you'll have years (or a decade) to recover. The expected long-term return of equities (roughly 5–7% real, 7–9% nominal) far exceeds bonds (1–2% real, 3–4% nominal).
Why these boundaries?
The 3-year and 10-year marks are empirical:
Three years is roughly the minimum to have a good chance of recovering from a typical bear market (not a Great Depression, but a 2008 or 2022 level event). From 1926 onward, a three-year holding period caught you in exactly four negative periods (1928–1931, 1937–1940, 2000–2003, 2008–2011). Over 99 separate 3-year periods, you lost money in four. Not great odds, but possible—which is why you don't hold stocks at a 3-year horizon.
Ten years is the horizon where historical odds shift decisively. Only one 10-year period (1929–1939) lost money. That's 97 positive out of 98 periods. Statistically, holding an equity portfolio near a 10-year horizon is a favorable bet.
The boundary at five to seven years (the medium range) is where investors balance the risk of crash-at-the-wrong-time with the return advantage of equities. The exact allocation is personal; the principle is universal: longer horizons justify higher equity exposure.
Horizons in practice
Most investors don't have a single horizon. You might have:
- £8,000 for emergencies (0-year horizon → 100% cash)
- £15,000 for a holiday in 18 months (1.5-year horizon → 100% cash or short gilts)
- £35,000 for a house down payment in five years (5-year horizon → 50/50 stocks/bonds)
- £200,000 for retirement in 22 years (22-year horizon → 85/15 stocks/bonds)
- £50,000 earmarked as a legacy (40+ year horizon → 95/5 or even 100% stocks)
The portfolio you build isn't one allocation. It's five allocations, one for each goal's horizon. This bucket strategy removes the temptation to panic-sell long-term holdings when the market crashes, because you never need to touch them.
The horizon chart
The relationship between horizon and stock allocation is not linear, but it's predictable:
Related concepts
Next
Understanding the boundaries is one thing. Grasping why these boundaries exist—how volatility compounds, how drawdowns compound recovery time, why a 50% loss requires a 100% gain to break even—is another. That's where we turn next.