Some systems have effect whose length is based on a number of sessions. For example:
- Marvel Heroic Roleplaying has a Refresh of Plot Points at the beginning of every session
- Fate Core has a refresh of Fate Points at the beginning of every session. Similarly, Moderate consequences recover at the next session after having been treated.
- The Destiny Pool in Star Wars Edge of the Empire is built at the beginning of each session.
This is nice and all, but... what about play by post? Gaming is pretty much continuous in pbp, and there is no such clear way of sequencing the game.
Is there a standard/accepted way of deciding when to have those session-based effects when your game doesn't actually have sessions?