i might be wrong but looking at the info in the announcment, they are taking a daily snapshot (like spliterlands does for their airdrops):
"The rough figures are at least 0.15+ POLYCUB per 1 CUB staked with snapshots taken daily for the 60 day period. For example, if you have 1,000 CUB in the Kingdom you'll get ~150 POLYCUB airdropped daily over 60 days to your Polygon address (~2.5 POLYCUB per day)."
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