You cannot copy and paste with the K3, but you can with 3 laptops, 1 desktop and my iPod Touch. Therein lies the difference.
I read a study the other day that said a 12 character PW was about the optimum length. An 8 character one can be cracked with the correct tools in a fairly short time, but statistically a 12 character PW would require a battery of computers working in tandem for years to break. A 64 character PW, though virtually impossible to crack, is over kill. And I bet you have it in a file someplace so you can copy and paste. If you do then it could be 6400 characters long and it will get cracked.