The Old Temple is a location and mechanic in Persona 5 Royal.
The activity is similar to training. Initially, meditating at the Old Temple grants the protagonist 3 SP to their max value. However, every 3 times they meditate, the amount of SP they get improves by 3. This applies for until after the 10th day, at the maximum of 12 SP per day.
|1st to 3rd||3 SP|
|4th to 6th||6 SP|
|7th to 9th||9 SP|
|10th and after||12 SP|