Yes, you put $3,500 for every month of the year because of the last-month rule, which states that if you have HDHP coverage in the last month (i.e., on December 1st), then you are permitted to use the full annual HSA contribution limit (as if you have been under HDHP coverage for every month).
But why are you filling in the 8889 yourself? Use the amendment process in TurboTax - it would apply the last-month rule automatically.
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