This is a stab-in-the-dark but the only hymn that comes to mind is
Work For The Night Is Coming

Work, for the night is coming,
Work through the morning hours;
Work while the dew is sparkling,
Work 'mid springing flowers;
Work when the day grows brighter,
Work in the glowing sun;
Work, for the night is coming,
When man's work is done.

Work, for the night is coming,
Work through the sunny noon;
Fill brightest hours with labor,
Rest comes sure and soon.
Give every flying minute,
Something to keep in store;
Work, for the night is coming,
When man works no more.

Work, for the night is coming,
Under the sunset skies;
While their bright tints are glowing,
Work, for daylight flies.
Work till the last beam fadeth,
Fadeth to shine no more;
Work, while the night is darkening,
When man's work is o'er.

I'm looking for a hymn, sone stanza of which ends with "'til man's work is done."