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Right, cause yesterday my wallet was only open for about 10h and I still stacked.
This time 5 days since last stack with 3k GRC and a mag ~ 100.

No way that in this time 900 blocks passed through - if you look at the block-explorer from gridcoinstats you see that each block needs ~1-3 minutes ... 900 blocks would mean 15-45 hours.

Block opened wallet:
1082418
Block stacked:
1082821

Average time between two blocks is 90 seconds (also called block time target). Network tries to maintain 960 blocks per day and was recently very close to this number. So 900 blocks is 22 hours and a half.

There is no good and bad uptime. It is proportional and random. If you stake only 12 hours per day, you have half the chance to stake then you would have staking 24 hours.

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