On the first and sixteenth day of each month, the Abyssal Moon Spire's rewards will be reset. On the first day of each month, a new period of Blessing of the Abyssal Moon will begin. Abyss Corridor rewards do not reset.

Does Primogems reset spiral abyss?

Spiral Abyss

The Spiral Abyss is available at AR20. However the earlier stages only give a once off first clear Primogem reward (more on this later). Floors 9+ of the Spiral Abyss reset fortnightly. These floors reward 150 Primogems per floor.

What happens when the Abyss resets?

What happens when Abyss resets? All progress and rewards on F9-12 will be reset. You will have to beat each floor again but you will be able to collect the reward for clearing each chamber as well as obtaining stars.