The in-game description of Overtime is as follows; "Extend the availability period of all situation commands each time a new situation command appears." You may notice the description of Overtime's effects I have put in this page differ from what the in-game description states its effects to be, that is due to both the Ultimania's description of Overtime's effects and my tests of Overtime in-game seeming to contradict the description. I believe the English description of Overtime in-game may be a translation error, so seeing what the description says in-game in other languages might be helpful regarding that matter.
For the record, the Ultimania's description of Overtime is; "シチュエーションコマンドを使ったとき、その残り時間がほかのコマンドに加算される".
Furthermore, my own in-game tests with Overtime active have concluded the following:
- Situation Commands' availability period is not extended when a new Situation Command appears while Overtime is active
- While Overtime is active, using a Situation Command results in its remaining duration being added to the duration of all other Situation Commands, this does not happen while Overtime is not active