Receiving gateway timeout on Cloning subdomains in a multisite installation


I have installed Cloner on this site and I was able to successfully clone my main domain to the first sub-domain. However, I need to clone this to two more sub-domains and it is just not happening. I keep receiving a Gateway Timeout error. This is hosted on a shared Siteground account and the max timeout value allowed there is 120. Can someone please help with a suggestion on how else I could clone my site?