How long was Paul's hiatus before Galatians 1:18?

Paul's hiatus before Galatians 1:18 lasted three years. He had now finished this three-year hiatus, evidently spent with the Lord alone down in Mount Sinai in Arabia. This is the period referenced just before Galatians 1:18, after which Paul's narrative continues.

Les explains that when they left off at Galatians 1:18, Paul had now finished his 3 year hiatus, evidently with the Lord alone down in Mount Sinai in Arabia. He notes that someone asked him why it took 3 years, and he proceeds from that point in the text. The program resumes at Galatians chapter 1, verse 18.

Galatians 1:18

Then after three years I went up to Jerusalem to see Peter, and abode with him fifteen days.

What happened after Paul's three years alone, according to Galatians 1:18?

Galatians 1:18 states that after Paul's three years alone, he went up to Jerusalem to see Peter. This followed his time of receiving revelations in Arabia, after which he took the message to the Gentile world rather than to Israel.