Different asset classes can deliver varying levels of returns for any given investment horizon. The following matrix can help you with the same
Debt Asset Class - Between 7% to 9%.
Ideal investment horizon is very short to medium term (few months to say 5 years)
Equity Asset Class - Between 10% to 15%.Ideal investment horizon is long to very long term (say over 5 years)
You may partly invest in both to get an appropriate asset allocation for your investment horizon.