When using Alibaba Cloud SLB, a user configures the Health Check as follows: response timeout value set to
5 seconds, Health Check interval set to 2 seconds, unhealthy threshold value set to 3, and healthy threshold value set to 3. That is to say, to confirm a backend ECS instance is healthy, three successive normal responses are required.
If the current status of a backend ECS instance is unhealthy, and you finish the repair work immediately, it will take at least _______________ for SLB Health Check to confirm this instance is healthy again.