To even give a ballpark I would need to know more details…
I’m assuming this is related to the site from the original post, yes?
It appears that they are using something called Wufoo for the form on that site. A quick glance it does not appear there is a way to get data from a submitted form. This would be critical because that submitted data would be needed to input the data into Connections.
Just thought of something… I did do a Connections/Gravity Form integration a couple months ago which will at several hundred plus.
Hope that helps, let me know.