Answer by taking a quote from the following article:

Eddie James "Son" House, Jr. (March 21, 1902 - October 19, 1988) was an American delta blues singer and guitarist, noted for his highly emotional style of singing and slide guitar playing. After years of hostility to secular music, as a preacher and for a few years also as a church pastor, he turned to blues performance at the age of 25. He quickly developed a unique style by applying the rhythmic drive, vocal power and emotional intensity of his preaching to the newly learned idiom. In a short career interrupted by a spell in Parchman Farm penitentiary, he developed to the point that Charley Patton, the foremost blues artist of the Mississippi Delta region, invited him to share engagements and to accompany him to a 1930 recording session for Paramount Records.

House was born in the hamlet of Lyon, north of Clarksdale, Mississippi, the second of three brothers, and lived in the rural Mississippi Delta until his parents separated, when he was about seven or eight years old. His father, Eddie House, Sr., was a musician, playing the tuba in a band with his brothers and sometimes playing the guitar. He was a church member but also a drinker; he left the church for a time, on account of his drinking, but then gave up alcohol and became a Baptist deacon. Young Eddie House adopted the family commitment to religion and churchgoing. He also absorbed the family love of music but confined himself to singing, showing no interest in the family instrumental band, and hostile to the blues on religious grounds.  When House's parents separated, his mother took him to Tallulah, Louisiana, across the Mississippi River from Vicksburg, Mississippi. When he was in his early teens, they moved to Algiers, New Orleans. Recalling these years, he would later speak of his hatred of blues and his passion for churchgoing (he described himself as "churchy" and "churchified"). At fifteen, probably while living in Algiers, he began preaching sermons.  At the age of nineteen, while living in the Delta, he married Carrie Martin, an older woman from New Orleans. This was a significant step for House; he married in church and against family opposition. The couple moved to her hometown of Centerville, Louisiana, to help run her father's farm. After a couple of years, feeling used and disillusioned, House recalled, "I left her hanging on the gatepost, with her father tellin' me to come back so we could plow some more." Around the same time, probably 1922, House's mother died. In later years, he was still angry about his marriage and said of Carrie, "She wasn't nothin' but one of them New Orleans whores".  House's resentment of farming extended to the many menial jobs he took as a young adult. He moved frequently, on one occasion taking off to East Saint Louis to work in a steel plant. The one job he enjoyed was on a Louisiana horse ranch, which later he celebrated by wearing a cowboy hat in his performances. He found an escape from manual labor when, following a conversion experience ("getting religion") in his early twenties, he was accepted as a paid pastor, first in the Baptist Church and then in the Colored Methodist Episcopal Church. However, he fell into habits which conflicted with his calling--drinking like his father and probably also womanizing. This led him after several years of conflict to leave the church, ceasing his full-time commitment, although he continued to preach sermons from time to time.

How long was he a pastor?
This led him after several years of conflict to leave the church,