How many Deployment connections can we create for the deployment in salesforce org?

Deployment Connections for Change Sets
A deployment connection is required between two Salesforce orgs to send change sets from one org to another. You can’t create deployment connections between arbitrary orgs. Instead, you create connections between all orgs affiliated with a production org. For example, if you have a production org and two sandboxes, a deployment connection is created between production and each sandbox. Also, a deployment connection is created between the two sandboxes.
Authorizing a Deployment Connection
Authorize inbound changes so that another Salesforce org can send change sets to the org you are logged into.
Viewing Available Deployment Connections
A deployment connection enables customizations to be copied from one Salesforce org to another. The deployment connections list shows which orgs are authorized to upload changes to this org, and which orgs allow this org to upload changes to them.
Viewing Details of a Deployment Connection
A deployment connection enables customizations to be copied from one Salesforce org to another. The deployment connections list shows which orgs are authorized to upload changes to this org, and which orgs allow this org to upload changes to them.