The welders worked double and triple shifts, driven by greed and cocaine, and the inspectors who ran the X-ray machines were on the same schedule.

Extent of use i.e. single shift, double shift, triple shift.

What's to stop me putting you all on triple shifts?

"Only the logic that a commander shouldn't have to take a triple shift, sir," the young lieutenant suggested softly; he was met with a raised eyebrow.

"If I'm to report for piloting lessons on my first off-shift, won't the captain be pulling a triple shift?"

When this disease was cured he would make the Bajorans work double and triple shifts to make up for the lost production.

Olive worked triple shifts in a plastic bag factory to make ends meet.

The rest of us had to pull double and triple shifts.

Double shifts that became triple shifts tended to end in loss of efficiency from exhaustion.

In September 2011 the staff had to work triple shifts.