It seems that the daily reminder isn't very reliable. I used to have it set to 10pm but the reminder would often come late (after midnight) and I would lose my streak.

I recently set it to an earlier time (8pm) hoping that even if it was late I would still have time to do my lesson before the end of the day.

However this time I haven't received it at all. It is now 9am where I'm from and I haven't received it yet. This has happened before, however I usually get it, but not often on time. This applies to both the email and the push notification (on Android).