What was the future date recorded in the Tunguska region when the soil was radiocarbon dated by Italian scientists in the 1990s?

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The date isn't real. Radiocarbon dating assumes that the ratio of C-12 to C-14 remains constant. Whenever an event changes this ratio, as the Tunguska meterorite did, or nuclear weapons testing, the formula usually used is no longer valid.
There was no real 'future date' only a mistake.
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How does radiocarbon dating work?

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In Chemistry

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It would depend on the lab (policies, administration, etc.), the sample (age and composition) and procedures required. At least a couple of days, possibly a couple of weeks.
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