@Kuldeep Kulkarni
create cluster command is asynchronous, what specifically will you gain from having a timeout? You may need to file an enhancement jira with Ambari project.
Step 5: Create Cluster
POST /api/v1/clusters/:clusterName
Request body includes blueprint name, host mappings and configurations from Step 3.
Request is asynchronous and returns a /requests
URL which can be used to monitor progress.