Node failover time of mongodb is very high

Hi Team, I am new to the openebs and mongodb. I am trying to test the node failure of mongodb statefulset application on openebs. I have 3 node setup in GKE, each mongodb pod runs on a separate node. I killed the node which hosts primary mongodb pod and checked for secondary mongodb pod running on another node to become primary mongodb pod. I got more than 100 seconds as the outage(secondary becoming primary).
So, I have few questions:

  1. Is it really 100 seconds node fail over time of mongodb on openebs?
  2. Should we fine tune any parameters to reduce the node failure time.

Early help should be deeply appreciated.
Thanks