Do Bi-Weekly mortgage payments only reduce the mortgage time because there is an extra payment?
I thought that the main benefit to Bi-weekly payments was that the was less time for "interest to earn interest" because instead of wait all the way to the end of the month with interest building up, you pay off the charge half way, which prevents
It's mostly the extra payment. A 1st/15th type payment might reduce your total charge very slightly, but the extra monthly payment in a bi-weekly setup makes a much bigger difference.
Incidentally, redwine is wrong, a bi-weekly payment

Under the current
Bi-Weekly Mortgage Payments .
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Bi-Weekly Mortgage Payments
Bi-Weekly Mortgage Payments
Bi-Weekly Mortgage Payments