sha-256 more than 20 char

[slyexe]

You will not be able to use hashcat directly for attempting such a large brute force keyspace. You can however use a dictionary with rules, or pipe a mask to hashcat and apply rules. Anything over 12 characters usually is not compatible to be bruteforced with a character set.

Check out the Wiki for more information on attack modes and details regarding what hash mode to use.

https://hashcat.net/wiki/
https://hashcat.net/wiki/doku.php?id=example_hashes