How much time ECS Service need to provide a new task using FARGATE_SPOT

Question

I'm using FARGATE_SPOT as a provider and the desired count is 1. I would like to know how much time ECS Service need to provide a new task after AWS send the SIGKILL.

 Service:
    Type: "AWS::ECS::Service"
    Properties:
      ServiceName: service-fargate-spot
      Cluster: !Ref EcsClusterName
      DeploymentConfiguration:
        MinimumHealthyPercent: 100
        MaximumPercent: 200
      DesiredCount: 1
      HealthCheckGracePeriodSeconds: 40
      CapacityProviderStrategy:
        - CapacityProvider: FARGATE_SPOT
          Weight: 1

One running task is enough, but I'd like to not have to wait for the first task to stop before the next one runs.