What does "at a stretch" mean?

In one continuous period of time; at a time.

At a stretch

Common synonyms include: ad infinitum, again and again, constantly, continually, endlessly, incessantly.

adv

adv ·Rare ·Advanced level

Adverb

1
In one continuous period of time; at a time. UK, not-comparable
"He worked for fifteen hours at a stretch."

"He worked for fifteen hours at a stretch."