To Hiske...
7 or more means 7, 8, 9, 10, 11, etc... you can stay for only 22 hours if your block is longer than 6 hours.
6 green and not more than 6 -> max 23 red - tested by me many times, still not even 1 ban.
7 or more green -> max 22 red - tested by many bulgarian players - after 23 hour is started one gets banned for 10...reports say it's not enforced immediately but couple of minutes after the start of 23th hour.
no green -> no clear information (I've stayed for 20 playing with no block, but fell asleep and couldn't test. Probably one can stay for at least 22, maybe 23 but I wouldn't risk if I have army
)
My recommendation - always have 6 hour block, no matter if you do or do not plan to stay for 23 hours.
btw updating the first post with details will be helpful