you can define up to 4 custom charsets, you defined -1
so -2 , -3 and -4 are undefined, nothing to worry about
ps you could shortened your -1 by using built in charsets like this
-1 ?l?d
which means ?l = lower chars, ?d = digits
see https://hashcat.net/wiki/doku.php?id=mask_attack
the other thing with speed,
scrypt was specially designed to resist attacks with gpu/cpu or other specialised hardware (like asics) so it will likely to be impossible to crack this/your ethereum wallet with brute force
so -2 , -3 and -4 are undefined, nothing to worry about
ps you could shortened your -1 by using built in charsets like this
-1 ?l?d
which means ?l = lower chars, ?d = digits
see https://hashcat.net/wiki/doku.php?id=mask_attack
the other thing with speed,
scrypt was specially designed to resist attacks with gpu/cpu or other specialised hardware (like asics) so it will likely to be impossible to crack this/your ethereum wallet with brute force