'Week' in the Bible

and when he saw that it pleased the Jews, he proceeded to have Peter arrested as well. This was during the days of Unleavened Bread [the Passover week].

We sailed from Philippi after the days of Unleavened Bread (Passover week), and within five days we reached them at Troas, where we stayed for seven days.

And upon the first day of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight.

Here we found brethren, who invited us to remain with them for a week; and so we reached Rome.