Mathematically, it means that the number of lines read is bounded by 10*M, where M is some constant. So it's basically equivalent to saying that it's O(1).
I'm guessing that intention was to say "around 10 lines", though it kind of stretches the definition if we're being picky.
I'm guessing that intention was to say "around 10 lines", though it kind of stretches the definition if we're being picky.