Pentecost is the longest season of the church year. Advent, as you know, is four Sundays, leading up to Christmas, and Christmastide lasts twelve days, from Christmas to Epiphany (that’s the “Twelve Days of Christmas” from the song). Then Epiphany is anywhere from four to seven weeks or thereabouts, ending with Ash Wednesday, which begins Lent. Lent is forty days—minus Sundays—and then Eastertide lasts from Easter to Pentecost Day, seven weeks. After Pentecost Day comes the Season of Pentecost, which runs all the way through the late spring, summer, and fall, until Advent begins again.