"Checks Running, Server Will Restart Within The Next 60 Seconds Without Further Warning, You Are Advised To Quit Any Active MiniGame To Avoid Possible Inventory Loss."
Or
"Checks Running, Server May Restart Within The Next 60 Seconds Without Further Warning, You Are Advised To Quit Any Active MiniGame To Avoid Possible Inventory Loss."
The first message will always be broadcast at the midnight and midday checks as these will always require a restart to rotate logfiles etc.
The 3am/pm, 6am/pm and 9am/pm checks will virtually always be the second message, and the server may or may not restart, by shuffling the maintenance around a bit I've made it so the server is far less likely to require a restart at these times.