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You know what I think, as I ran mining on iMac (which was powerful) and then stopped (because I'm not using it now) - and continue to mine on laptop only, but because I mine for some time, this power is also continues to run on inertia,, I see decreasing in mining day by day, but still I have around 1 GRC a day..
May be I'll have less, but I believe GRC will grow so that's good to continue!