behavior of ServerAliveInterval with ssh connection

Using ssh I am logging to another system and executing scripts there that creates new machines, and do some setups. It takes around 7-8 hours. So what happened is, the ssh connection keeps dropping and I always get timeout with unsuccessful execution of the script. So now I am using this argument along with ssh connection: ssh -o ServerAliveInterval=60 user@host .... This ssh is spawned multiple times. The problem is after few ssh connection, I am getting error : too many logins of user and the after ssh connections are getting closed just after successful logins. So is it the behavior of the **ServerAliveInterval**, that keeps the ssh user login session in remote machine alive even after ssh work is over and that's why my further logins are disconnected?