Refresh happens every five minutes at XX:X3 and XX:X8. For example: 12:03, 12:08, 12:13, 12:18 and 04:53.
At the refresh a player regains 10 Battle Points (14 if they have the Morale Boost skill and are standing on a monument) and 5% of their maximum MP (players regain more MP if they are meditating at the time of the refresh). A minimum of 5 MP is always regained at each refresh.
At XX:X4 and XX:X9 monsters have their move turn, and might change tile or attack players who are not hidden.