I would say eve personally.
After a couple of years of playing I had never touched PvP but after hearing about a hi sec piracy corp clled Darkness Inc I decided to make a new character and join them.
Within about a day of finishing the tutorial I was a member of the corp, within 3 days I had learnt the basic skills I need to warp scram the enemy. Then we simple went out in small frig groups taking on battlecruisers and battleships. Absolutely great fun.
We also did low sec but never 0.0.
To really get into 0.0 you would have to join a corp with access to that space, problem is that many corps have a minimum skill point requirements of 5 million+, i've seen some around the 20million mark too.
I have no idea on that time frame but you are least talking several months.
I would also suggest specialising in one area, one of my characters was trained purely for combat, weapon skills and armour skills. Another was trained for scanning, probing and stealth. I actually found a Raven completely fitted in Hi sec just left abandoned by a planet

Had to get a corp mate to fetch it for me though as I couldn't fly it!