How is it determined when reviews are scheduled?

[gojarappe]

See Leebo’s reply from a different thread:

How long between reviews

There used to be a difference between the item types, but it’s been the same across all 3 for about 6 months now. Lesson 4 hours 8 hours 1 day 2 days (complete this and you are at guru) 1 week 2 weeks 1 month 4 months For any times 1 day or longer, subtract one hour. Additionally, these times are calculated from the previous hour. i.e. you do a lesson at 6:30, it rolls back to 6:00 for the calculation and then the review comes at 10:00.

There might be a bug in the script or the system, though. Maybe someone with more knowledge can answer this.