Cache.Session not honoring ttlSecs argument?

Question

I'm using session cache and trying to set the TTL (lifetime) to 60 minutes. However it is expiring much more quickly (it appears to be using the default 5 minute expiry). The docs say TTLs is seconds not milliseconds. Do I need to override the default TTLs at the partition or platform level as well?

private void putTokenInCache(String token) {
    if (token != null) {
        Cache.Session.put('token', token, 3600);
    }
}