As time progresses, hardware improves.
Just to give you an idea,
With rainbow tables, it was entirely possible in 2008 to hack an 8 digit password with numbers and letters within 10 minutes. And that was on a simple intel dual core 1.6Ghz processor.
Rainbow tables are pre-calculated passwords, where a massive pc often spends an entire year generating passwords in a file, and compresses them to fit a dvd.
The computer using the dvd, with the right software, could literally process in 10 minutes, the passwords that took a very fast pc 1 year to generate.
Rainbow tables reduce hacking time by a factor of almost 1000x shorter.
At current, our limitation is 8 characters (letters, numbers, and symbols), or a combination of 13 letters and numbers.
I don't forsee hardware becoming much faster in the future, as Intel is working on lowering the power envelope, and heat emissions of cpus, rather than increased speeds.
However I do see increased speeds on server side, through the use of more multicores
It might be entirely possible that a future server could hack 15 digit passwords within a reasonable amount of time, while with current technology, 13 digit passwords with symbols, still take almost a full year to crack.
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