From: The Republic of Texas
I've played the full campaign through to completion twice - once under the orginal game and once under AE. Both times took a little over a year, but that includes vacations, trips overseas, business trips, and some non-motivated periods.
There may be slow times when you can run 4 day turns, and other times, such as during amphib invasions, that you will want 1 day turns.
Both games were human Allies vs Japanese AI and I won both with Major Victories, once in August 1945 and the second in May 1945. The second game was the "ironman" scenario, which provides for special challenges.
In the first game, under the original game, I got very lucky and had my "Midway" stopping the Japanese invasion fleet short of Port Moresby with land based air and devistated the carrier force, damage from which they never recovered. In the second game, because land based bombers had been nerfed vs naval, I was very cautious about investing my carriers in battle and afraid if I lost them I would not be able to stop the KB, so I did little damage to the KB. I had two successful surface battles when British BB squadrons encountered some of the surprise ships in the scenario.
I moved up the Solomon's and the KB came out when I attacked Rabaul as they did later when I attacked Guam, then Iwo Jima. All three times they got severe butt stompings handed to them by the USN. I cleared out New Guinea,half of the PI, and Okinawa when the Japanese surrendered.
My key was not to fight a strategic, theater wide battle of attrition, but organize forces for overwhelming attacks designed to wipe out the Japanese with as little loss to the Allies as possible by concentration of forces.
Also, in the CBI, not much was accomplished in China, but India was held and a strong counter thrust put into place to throw the Japanese out of Burma and Thailand. At the end of the game, I was reading for attacks on Bangkok and towards Tavoy.
Keys. Logistics. Get your CS and autoconvoys in place. As the autoconvoys come out of SF, you could do fuel CS convoys from LA and troop and airplanes out of other ports.
When you perform and amphibious assault always have bases and supplies ready to move in so you can start repairing, expanding and using the base immediately.
Pay special attention to always having fuel in the pipeline moving west. If necessary, it can be diverted to a different port than the original planned destination.
Getting supplies and bases moving forward is paramount. Set up, and understand your replenishment task forces.
Once you've learned logistics, everything else will fall into place.
I'll be happy to answer other questions you may have - they may not be the best answer, but it will be what I've done.