Two scriptures alone give us the answer of when the Lord will return:

 2 Thessalonians 2:3   (KJV)

1Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him, 2That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand. 3Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition

 The son of perdition, the Anti-Christ, until he has been revealed that day "shall not come".

 Matthew 24:29-30

 (KJV)

 29Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:

 30And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.

Immediately AFTER the tribulation...they then shall  see the Son of man coming in the clouds of heaven with power and great glory.