Title: embarking form enemy territory with 12 banked hours
Summary: Currently you need to have enough hours banked in order to embark. So it is impossible to embark from an enemy territory if it takes 13 hours.
Details: either cap the embankment time to 12 hours, or allow embarking to start with less than the total time required (similar to adventurers traveling over 16 hours).
Benefits: it would always make embarking possible.
Possible Exploits: it would always make embarking possible.