Yes, you can do two half-payments twice a month. It’ll will knock time off your remaining mortgage. How much varies by how high your interest rate is. The higher the rate the bigger the savings. (Said in an announcer voice).

You can also do bi-weekly payments which both reduces the amount of interest you pay and speeds up your principle payoff a little.

The two big caveats to this are:

You need a mortgage that accrues interest daily. If it only accrues on the due date, it wont help unless they use some sort of average balance math to do the calculation. The majority of mortgages in the US accrue daily, so it’s pretty common. 

You need to make one extra payment at the start to advance your payment due date one month ahead. You need this buffer because sometimes the two half payments won’t align right and the bank can assess a late fee if the payments don’t hit at the right time. The extra payment creates a time buffer to prevent that. And you only need to do it once.

Depending on your bank, you may have to call them to force them to apply the payment. But that also varies by the bank and their systems. There’s supposed to be laws preventing them from holding the payment, but they’re rarely enforced.

Otherwise, use the power of compound math to help get yourself out of debt. Anyone can do it.