Here is some information from my refresh_token. I believe it hasn't expired yet, since I've recently logged in again using Steam Desktop Authenticator.
Payload:
{
"iss": "",
"sub": "",
"aud": [
"web",
"renew",
"derive"
],
"exp": 1762718905,
"nbf": 1735992415,
"iat": 1744632415,
"jti": "",
"oat": 1744632415,
"per": 1,
"ip_subject": "",
"ip_confirmer": ""
}