Can confirm having a T7 rancor, t6 AAT guild helps a lot. I'm level 74 and already have 6 characters at G9 with the majority of their raid gear pieces complete already. Gear the right squads for each phase of HAAT and have a good squad for rancor and you'll get G11 on several toons much faster then a year. Our estimate as F2P in my guild is that it takes about 1 month to get a character to G11. It's faster if you save your 1400 crystals and snipe the right raid pieces from shipments.
My strategy is to subscribe to the crystal shipment pack. It's 10.99 for 2200 crystals, so basically you get 1.57 raid gear pieces a month with the crystals you get from this, plus your arena crystals. It's not quite F2P and not quite dolphin or whale. A good compromise.
Also make sure you do ALL your chalenges you can do, at the highest tier possible each day. DO NOT miss Sunday. Also, at 12, 6 and 9 you get quite a bit of gear for credits from shipments. I always buy all 4.
