Funny, all the Nexon games I've played to date have had weekly maintenance (and I played alot of f2p games while waiting for PSO2)... In fact I just visited Mabinogi Heroes website just now to be sure, and that HAS weekly maintenance listed right there under the main menu (http://heroes.nexon.co.jp/#maintenance). So I'm afraid the game you played was an exception not the rule.
Bet you it'll also have regular maintenance!
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