Characters
The Dothraki are not known for their punctuality.
— Magister Illyrio Mopatis ‧ Game of Thrones
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker offers a dry understatement about a people who are not known for punctuality, suggesting they are habitually late. It reads as a wry warning to anyone expecting them on time: patience will be needed, and schedules are a poor guide to when they will turn up.
Context reviewed