Acts 21:10

And as we tarried there many days
How many days is not said, it could not be very many, if the apostle got to Jerusalem by Pentecost, as he desired, ( Acts 20:6 Acts 20:15 Acts 20:16 ) ( Acts 21:4 Acts 21:7 )

there came down from Judea a certain prophet named Agabus;
of whom mention is made in ( Acts 11:28 ) who is there said to come from Jerusalem, to Antioch, and here from Judea to Caesarea; he had been many years going about from place to place prophesying, for between that and this account must be a space of about sixteen or seventeen years.