[Sylvanfan]

I pay bi-weekly accelerated for the primary residence where the monthly payment is cut in half and paid every two weeks. So it's like one extra monthly payment against the principal. Mostly because the spouse and I get paid biweekly. If you can do that during the first 5 years of a 25 year amortization, it's a thing that gets you out of the mortgage quicker than doing it in the last 15 type of thing.

Like the inverse in investing...stock up money for 5 years and get returns for 40 years vs wait 30 and try to catch up in the last 15.