I’ll bite, but I’m not qualified. It will be many years before I master my system.
If you want to build a 2-card system, it will take a long time to succeed. It’s just a demanding process. I think a 2-card system is about 20% faster than the alternatives. Early on, you’ll be going 20% faster than with PAO at the same “skill level,” and when mastered, it can be very, very fast.
If I pull up a bunch of numbers, like Josh’s link, and I read through the images, not memorizing them but just saying them in my head, I can read up to 240, on average about 210 - 220 digits in one minute. I could be much faster at this, but I’m still getting used to having a very large object list.
At least Three people have memorized 50 digits in under 8 seconds. I think one person did it in under six seconds. They used 3 digit numbers.
If you work on creating, memorizing, and using a 000-999 list daily, then I would say anyone could expect to be better than they are today in six months. For me it was a bit faster.