Amount of seconds a user has to wait before sending another message (0-21600); bots, as well as users with the permission MANAGE_MESSAGES or MANAGE_CHANNELS, are unaffected

rate_limit_per_user also applies to thread creation. Users can send one message and create one thread during each rate_limit_per_user interval.

For thread channels, rate_limit_per_user is only returned if the field is set to a non-zero and non-null value. The absence of this field in API calls and Gateway events should indicate that slowmode has been reset to the default value.