Talk:Achievements/@comment-91.39.90.57-20100828114539/@comment-98.216.56.117-20100903033017

It can be done in a month if you are starting fresh. The key is to do boss fights, which return a percentage of your cash, allowing for exponential growth, but you have to keep your energy really low so that it recharges fast enough to do lots of boss fights. If you've already put tons of points into energy, you won't get this achievement, but you might get 10T after several years.