A 30 year mortgage is a 30 year mortgage. If you are able to arrange scheduled payments every 2 weeks you will not shorten the maturity (final payment) date. That amortization schedule will, however, accelerate the transition from interest to principal in each payment. (Payments are level, i.e., the same each payment period. Each payment consists of part interest and part principal. On a 30 year mortgage, almost all of the early payments are interest. As the little bits of principal slowly pile up, the part of each payment that is interest slowly gets smaller and the part that is principal slowly gets larger.)
The effect of prepaying principal is typically to shorten the maturity, and is not a bad idea. Though if you have a mortgage that carries a 3.8% interest rate and a credit card balance that carries an 18% interest rate, using the free cash flow to pay off your credit card is way smarter. If the more expensive (i.e. higher interest) debt is all paid off and there's still free cash flow, paying down principal is a good practice.
This post was edited on 10/6 at 7:06 am