“And Paul, as his manner was, went in unto them, and three sabbath days reasoned with them out of the scriptures,”
King James Version (KJV)
17:2 And Paul, according to his custom - Of doing all things, as far as might be, in a regular manner, went in to them three Sabbath days - Not excluding the days between.
Ac 17:2 Paul, as his manner was. It was his custom always to begin his work in the synagogue if he found one. Here he showed from the Old Testament that the promised Messiah should die, and rise again, that Jesus complied with these conditions, and hence must be the Christ. This line of argument was continued in the synagogue for three sabbaths. This indicates how long he continued to argue in the synagogue, not how long he remained here.