How long to make your money 5 times at 15% return?
At 15% annual interest, compounded annually, it takes about 11.52 years to make your money 5 times its value.
How is this calculated?
This uses the compound interest formula solved for time: years = ln(multiple) / (n × ln(1 + rate/n)), where n is the compounding frequency. At 12% annual compounding, for example, money roughly doubles in about 6 years, following the well-known "Rule of 72" approximation (72 ÷ rate).