Big mistake using Blizzard as a example. There terrible. Every major update the games unplayable for a month. There even worst than EVE.
Granted more information would be nice. EVE learnt this the hard way as I suspect Frontier will since there determined to go the online route. Give them time they have a very steep learning curve.
I'm not sure what version of WoW you play, but thus far, the longest recent downtime was the Warlords of Draenor launch, which was a week. That was catastrophic, however, Blizzard then issued free game time as a way of compensation and apologised unreservedly to everyone affected. They have one weekly maintenance window, which is usually a few hours, and if they can manage it, rolling restarts which are much shorter. Things have come a long, long way since the bad old days of WoW 1.0. EVE has had their share of nasty downtimes too, but much like Blizzard, they've got on top of this matter and by and large, they are now at a point where they are more than capable of withstanding situations far far in excess of the issues discussed on this forum.
Before anyone goes around claiming WoW or EVE are terrible, you'd do well to remember Blizzard's edge network deals with around 10m concurrent players at it's peak globally, and EVE has the single biggest "Shared" world *anywhere*. EVE's network and server infrastructure is the kind of thing that when you read about in technical papers is the sort of thing they hand out to trainee NOC techs at google and say "This is what you should aspire to". Hell, even people at the LINX had a lot of respect for CCP's work back when -I- was working there. Blizzard have wrangled a similarly tough problem. So eh... perspectives please.