According to dictionaries 'as long as' means "during a period of time", (as long as you liveas long as you live), but it also means "on the condition that" (I will attend the conference as long as I can arrive on timeI will attend the conference as long as I can arrive on time).
I'd like to know if, does the second usage comes from the first, original one or hasdoes "long" have a different meaning here?