If I add 100,000 to a mortgage 5.2% (Boat) and pay 900 a month how many months before it’s payed?

I have a 200,000 mortgage at 5.2% I would like to add my boat to the mortgage.. I pay 900 a month
how many months before the 100,000 is payed off
I pay 900 a month just for the100,000 ..
Just to clarify

10 years ago I added 100,000 to an existing mortgage of 125,000 on a house worth 600000

I then took the 100,000 and paid off my line of credit of 100000 which I used to buy a boat

The mortgage is being paid by my wife.. I pay her 900 a month for the 100000..

How long till I pay off the 100000 at 900 a month

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