So a few weeks ago I stumbled across the portal to Central City in the Watchtower.
Yay! New content!
... but it turns out you need a combat rating of 53 to be able to access it.
So I get another 30 and check out the armors that can be earned ... and they'd make give you a combat rating of 53!
Woot!
Then I see just how many Marks you need PER piece ....
And I ask in general chat how long that'd take...
And someone tells me about six months...
Guess I won't be seeing Central City anytime soon if I'd have to grind the gear to get access...
I've taken three toons high enough to get into Central City in the last few months. It's not as bad as it sounds, if you're willing to run the content.
If you have the DLC that grants you access to the Brainiac mishes in South Gotham, I highly recommend doing those daily for 5 Marks of Triumph each. 4 of those will be 20 Marks a day right there.
Run the T1 challenges from the On Duty menu and get more Marks. That will help you get into a suit of T1 gear within a couple weeks, without setting foot into a Raid or Alert. Hit the PvP weapon vendors in the Reactor in the Watchtower and pick up the level 30 weapon until you get a better one, either as a drop in the T2 content, or from the vendors in Central City.
Gather as many exobits as possible to craft up Mods for your T1 gear. Mods are sort of like IOs. Matching the color of the mod to the color of the slot for each piece of gear will grant you a bonus. All of those Mods will boost up the item level of each piece of gear as well. I went into Central City with each of my three level 30 heroes, having run almost entirely solo to that point, with Modded T1 gear.
Once you're in there you can get an easy 120 Marks a day by doing the mishes for Bounties against the Rogues, plus Cork, Ruptures, Infiltrators, etc. Overall, you're looking at an hour or so a day with even a PUG team for the Central City stuff, which will also take you out into Metropolis and Gotham for the Bounties, plus closing Ruptures in the Speed Force that occur randomly in both cities.
With my rifle/gadgets troller (a direct port of my bots/ff MM and beam/traps Corr, the Maker of Artifacts) I skipped T2 to grab the Central City gear (unofficially T2.5). Maker then skipped his T3 gear, easily getting to CR 70 with Mods in his Central City gear. I'm now working on his suit of T4 gear. As for the time frame needed, Maker only had a CR of 34 when the Halloween Event ended. As of the Wayward Souls alert I was in last night, Maker is now at CR 78.
In short, don't get discouraged by what seems like an insurmountable amount. I'm an anti-social player who mostly plays solo, and I managed to get that far and then some in half the time that others are telling you it will take.
If you need help getting started with Mods and stuff like that, feel free to ask.