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Daniel 9:26-27
And after threescore and two weeks shall Messiah be cut off, but not for himself: and the people of the prince that shall come shall destroy the city and the sanctuary; and the end thereof shall be with a flood, and unto the end of the war desolations are determined.
And he shall confirm the covenant with many for one week: and in the midst of the week he shall cause the sacrifice and the oblation to cease
In 70ad, the Romans destroyed Jerusalem and the Temple. And the 'desolations' deals with how the Temple has not been rebuilt since.
Therefore, the Romans (or a group that will be similar to Rome: like the UN, EU, or some other organization of nations) will make a future 7 year peace treaty, where the sacrificial system will resume.
The man who does this is the Antichrist.
Jesus will defeat him on the Last Day.
*This interpretation is the literal interpretation. There are other possible interpretations, but none are as clearly displayed in the text.*
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The point is that the 3 years Paul spent in the desert are not connected to some secret earthly ministry of Christ, hidden from Scripture.