I’m glad to hear you’re migrating to Tiller Money Feeds, @stuart. There are some great features we are able to offer once you have upgraded.
The Migration Helper in Tiller Money Labs is your best bet.
If the process hangs like that, it is almost definitely choking on something in your sheet. The process shouldn’t take longer than a few minutes.
Let me check the crash logs and see if I can get a handle on what didn’t work for you.