You don’t need the add-on anymore, ignore the add-on
@DerIshmaelite you will only get <1d reviews if your first parameters are sufficiently small and/or desired retention is sufficiently high.You are not guaranteed to get same-day reviews. If FSRS thinks that the optimal interval for Again for you is 1d, it won’t give you a <1d interval.
So yeah, it depends on parameters and desired retention.