This is the 2994th most frequent Russian word.
дольше
"Дольше" means "longer" (in terms of time).
In this sentence, 'дольше' signifies an extension of time beyond what is typical or expected, acting as a comparative adverb.
Я могу работать дольше обычного сегодня.
I can work longer than usual today.
Here, 'дольше' is used to compare his staying time to others', emphasizing the maximal extent of duration.
Он остался на вечеринке дольше всех.
He stayed at the party longer than anyone else.
In this statement, 'дольше' conveys a hypothetical extension of residence time in the context of a condition.