Ah okay that could certainly be the issue. With Local Connect specifically, we generally recommend manually importing large sites or databases anyway, as the sync can get spotty and have intermittent success depending on the overall size of the site, DB, and connection. Using the manual import method of just dragging and dropping a zip or importing through CLI I usually don’t see too much trouble or time passage with large sites and DBs, except specifically in instances where the DB has massive tables with millions of rows for example. Here was a user who came in this week and manually imported such a DB and said it took almost 24 hours.
We have some instructions here if you go the manual route or want to save for later: