For it (patient -um-) to be rooster-crow time, from about 2:00 AM to 5:00 AM.
A substantive with patient role is unexpressed in the sentence.
This period is subdivided as follows: penghan di talanu First rooster crow, about 2:00 - 3:00 AM; pidwan di talanu Second rooster crow, about 3:00 - 4:00 AM; pitlun di talanu Third rooster crow, about 4:00 - 5:00 AM.