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You can only earn them when you have the token staked or you delegate to zingtoken

How many zing tokens would I get if I staked 100000 Zing tokens? Any idea?

No idea but you'll get a lot of it, just make sure to claim rewards more often to keep increasing your stakes.

We have to claim once a day only or?

You get rewards to claim every hour but you can decide to claim whenever you think you'll have a lot to claim.

Oh okay, it means it wants our presence most of the day.

Not most, I claim once or twice a day most times 😅