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Yes, that's right, a change to 3 days will also need the reward period to be reduced. There used to be a dual reward period before, 12 hours or 24 hours and then a 30 day. Since almost no rewards were allocated after 24 hours or so, and it was too complex to keep two periods, it was shortened rather arbitrarily to 7 days as a middle-ground between the two. Since then it's become clear that even the 7th day no real rewards are added, apart from hiding abuse, so going back to a 3 day reward period would make sense. But if the 7 day reward period stays, then 1 week, that's why I offered both options in my comment above.

Oh i wasn't aware of dual reward period. I honestly dont mind 7 days time frame, however considering how volatile crypto is and given the fact that price has big influence on the rewards we might even consider reducing it. Cool, thanks for the time :D