public short loginRefreshBufferSeconds() {
        return loginRefreshBufferSeconds;
    }
The amount of buffer time before expiration to maintain when refreshing. If a
refresh is scheduled to occur closer to expiration than the number of seconds
defined here then the refresh will be moved up to maintain as much of the
desired buffer as possible.

@return the refresh buffer, in seconds
clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/expiring/ExpiringCredentialRefreshConfig.java