Not long!

Stand up, stand up for Jesus, the strife will not be long;
This day the noise of battle, the next the victor’s song.
To him that overcometh a crown of life shall be;
He with the King of Glory shall reign eternally.

(Apparently, Stand up, stand up for Jesus was originally written not as a hymn, but as the conclusion in a sermon on Ephesians 6:14)