The Middle Passage Timeline: 6–10 Weeks From Africa to the Americas

The transatlantic crossing during the slave trade era—known as the Middle Passage—typically took 6 to 10 weeks (42–70 days), though voyages ranged from 35 days (exceptionally fast) to 120+ days (disastrous). The duration wasn't a schedule—it was a variable of wind, weather, ship design, route, and human catastrophe.

Route & Seasonal Dynamics

• West Africa → Brazil (Angola/Benguela route): 35–50 days (shorter, favorable SE trades)
• West Africa → Caribbean (Middle Passage proper): 50–70 days
• West Africa → North America (Charleston, Virginia): 60–90 days (longer, variable winds)
• Season: Ships timed departure for trade winds; hurricane season (Jun–Nov) added risk/delays

Ship Factors

• Purpose-built slavers (e.g., Brookes, 1781): Copper-sheathed hulls (anti-fouling), finer lines — faster
• Converted merchantmen: Bluff bows, fouled bottoms — slower
• Tonnage: 100–500 tons typical; larger = more captives but not necessarily faster

The Human Cost of Duration

Every extra day meant:

• More deaths from dysentery, smallpox, measles, dehydration, suicide
• More captives thrown overboard (insurance fraud: "jettisoned cargo")
• More crew deaths (mortality 15–20% on slaving voyages vs. 5–10% on normal voyages)
• Higher provisioning costs (water, food, medicine)

Mortality averaged 12–15% of captives during the passage; on voyages exceeding 8 weeks, it often exceeded 20%. The Zong massacre (1781)—132 Africans thrown overboard to claim insurance—occurred after navigational errors extended the voyage.

Navigation Reality

No GPS. No chronometers (until 1760s, rare). Dead reckoning, latitude by noon sight, longitude by lunar distance (rarely mastered). Ships missed targets by 100+ miles regularly. The "2 months" figure is a reasonable central tendency—but each voyage was a roll of deadly dice.