Commentary for Berakhot 31:19
במה דברים אמורים בעושין בשכרן אבל עושין בסעודתן או שהיה בעל הבית מיסב עמהן מברכין כתיקונה:
To whom does this apply ? To those who work for a wage ; but should they work for their keep or their employer take his meals with them, they say the [entire] Grace after meals as ordained.
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
There would then be no opportunity for the labourers to waste time under the pretext of saying the entire Grace.
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