Boosters should not actively tick during logout and maintenance. The old system was fine. There's absolutely zero reason for a booster's time to continually die out when a player wants to take a break, lobby sit, etc. and there's especially no reason for a 24 hour booster to exist with this system.
Also, while on the subject, what's the point of a 24 hour booster that also actively ticks when there's a 1 hour booster that provides the exact same 10% EXP bonus?
https://pso2.com/news/announcements/boostitems0607 < post for those who missed this silly announcement