Puede ser literalmente de la misma longitud, (Esta ruta es as long as la otra ruta) O algo parecido a "mientras" or con la condicion de... I'm happy as long as I have music and my family around me. O Yo te presto mi carro as long as you don't take it onto the highway. O tambien, puede significar algo como "el mayor tiempo...." He is 70 years old, and he could retire, but he wants to keep working as long as possible. I know you're tired, but try to stay awake as long as you can.