CLARIFICATION
I've read above that users have asked more information about the staking overview.
Well, staking overview works as follow:
1) Last day: queries database, asking for TXs of type "generate" which have been received within 24 hours in the past
2) Last week: same as 1), but within 7 days in the past
3) Last month: same as 1), but within 30,5 days in the past
Overviews are updated hourly.
It's worth to point out that if a wallet remains f.e. in maintenance mode or halted for, to say, 7 days (like happened to Europecoin Wallet recently), it's obvious that as soon as it comes back active it will start generate more blocks than the daily average, because it remained "stack" for days accumulating weight without actually staking (in fact we've already seen this in Europecoin, that, after a week of maintenance mode, has been activated and in last 24 hours has generated almost 12,000 ERC, which is about 6x the daily average).
Hope it's clear now.
Cheers
Awesome and informative

Thank you for the great service!