@Perikles: I don't know which one is an exact comparative. I haven't been able to isolate a rule yet, thinking about it, "más de" is often followed by a quantity.
--Esperé al médico más de dos horas. (I waited for the doctor for more than two hours.)
--Esperaste menos que yo. (You waited less [time] than me.)
@Irma:
Juan is a good loved friend... he helps in many examples.
