Crack JWT HS256 with hashcat with Intel I9

[Jojo koko]

I have JWT with HS256 algorithm that I want to crack with hachcat using brute force.

I run : hashcat pass.txt -m 16500 -a3 --session my_session

1) I got warning 

The wordlist or mask that you are using is too small.
This means that hashcat cannot use the full parallel power of your device(s).
Unless you supply more work, your cracking speed will drop.
For tips on supplying more work, see: https://hashcat.net/faq/morework

Approaching final keyspace - workload adjusted

I don't have a wordlist or make, I just want to brute force.
What does this warning? 

2) How much time this crack will take on Intel I9 PC? Is that possible to crack and brute force all the options with original PC?

Thank you all!
.