20 characters
The maximum number of characters allowed for a file name varies by operating system. For example, in Windows, the maximum file name length is 260 characters, including the path. In contrast, most Linux filesystems allow file names up to 255 characters. It's important to note that these limits can be affected by the file system being used.
In Access 2010 and later versions, the maximum number of characters in a text field is 255. However, for memo fields, you can store up to 65,535 characters.
Linux does not have a limit as to the number of characters you can enter in a command.
The max number of characters from SMS messaging is usually limited to 160 characters.
15
You can send a maximum of 60,000 tweets per day.
There is no minimum number of characters that a Twitter username has to have. You can have a username with only one character, if you would like. There is a maximum number of characters that a username can have, though. A username cannot be longer than 15 characters.
30
depends on what password type you are creating. usually 4-6, but a computer password is usually 7. good luck :) be creative
32,767 characters in a standard text field.
Maximum number of characters in Diablo III is ten (10) per account.
There really isn't a such thing as a 'correct' password. A good password contains at least 7 characters, with at least one number. The password could be a jumbled mess, or an actual word. It is all up to you.