Our services have a high level of redundancy in place to minimize the risk of a service outage but this doesn't mean that there will never be an outage of any sort. In the event of any service outage we will be putting all available resources into rectifying the issue as soon as possible.
It isn't possible to give guaranteed timescales because that is dependent upon the issue. Some issues will take minutes to fix where as others will take longer. Some aspects may even be out of our hands and us be dependent upon third parties.
This is why it isn't possible to give guaranteed timescales other than we will do everything within our power to get the services live as soon as possible.