Taken straight from CLOUD-1 proposal 
“We propose to split this 30M CLOUD into two tranches of 15M each and distribute CLOUD quarterly. We plan to distribute the first tranche ~3 months after the passing of this proposal.”
This proposal was approved on 10th February 2025 and we are calling it as ASR too (for now)
ref: CLOUD-1: Should Sanctum implement CLOUD staking and active staking rewards?