In Update 1.18.1, reworked Personal Reserves are much easier to use.
Streamlined Personal Reserves have just three types (one per slot), two grades of bonuses, and a single duration: 1 hour. Play without bothering yourself with complicated calculations! Activate Personal Reserves on the fly with the modified UI—even when you’re in battle. Your old Personal Reserves have been converted into the new ones, and the conversion rules are all in your favor.