It took me about 4 months. Some of these were overdoses and some of these were 99Ks that I spent 150m+ on. I think I got out of Happy Jump quicker than most, but it felt like a long time and cost me a lot of money. My guess is that the quickest possible is somewhere between 2-4 months. I was not in a 10* AN and did not have the 48 hour booster cd perk for at least 2 months of my jumps.