Great summary for terminal length. But I was looking for how to save the setting and unfortunately could not find a single post that talks about that. So I dug on my own and found the answer for the Catalyst switches.
To save your terminal length setting use the length command under line con 0 or line vty 0 15 as such:
switch(config)#line con 0
switch(config-line)#length 50 (use number of lines that works for your terminal emulation software)
(if you do not wish to also setup terminal length for remote access then skip next 2 lines)
switch(config-line)#line vty 0 15
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