> Considering that it would take over a decade to return the original capital in value I think only 8.4 years, because that's the doubling period for 8.6% (1.0

> Considering that it would take over a decade to return the original capital in value I think only 8.4 years, because that's the doubling period for 8.6% (1.086^8.4 ≈ 2). Edit: but I guess it's indeed over a decade if you take tax into account