Can I pay a 30 year mortgage in 2 years?

The property is 65,000. I'm putting a down payment of 3.5% for the FHA loan. I'm graduating in two years and since my mortgage will be low because it's a duplex with tenants on one side, I will have help with the mortgage. I'm hoping to down 20,000 each year after I find a job. My question is, will the interest go on for 30 years if I pay all of it in 2 year? Because that would amount to at least 40,000 extra.

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