Timeout in invoke URL SOAP request

Timeout in invoke URL SOAP request

I have a quite big XML to send through a SOAP request. Initially, this works fine when starting small (30 orderlines instead of 100 orderlines) but when scaling up, I get a timeout because the timeout limit of the API call is 40 seconds in Zoho deluge. Is there any way to improve the data in my SOAP request (I have stripped all non mandatory fields from my request) or to prevent the timeout from happening? 

Any suggestions are welcome!