Perhaps you are familiar with the series's odd way of measuring time within a day. It does not come up often, and although I thought I saw it in other games, I was only able to search up examples in Radiant Dawn. This is the "mark."
( Length )
By the way, if you know other places in the Fire Emblem script that refer to a "mark" as a measurement of time, I'd be interested to have those examples.
ETA:
12/14/17 - With thanks to Glueblade: The German version rephrases two of these examples ("It won't be long until we get to Kisca" / "We'll rendezvous at Kunu swamp when the sun is above the horizon") and changes "You have half a mark!" to "You have an hour!"
( Length )
By the way, if you know other places in the Fire Emblem script that refer to a "mark" as a measurement of time, I'd be interested to have those examples.
ETA:
12/14/17 - With thanks to Glueblade: The German version rephrases two of these examples ("It won't be long until we get to Kisca" / "We'll rendezvous at Kunu swamp when the sun is above the horizon") and changes "You have half a mark!" to "You have an hour!"