Syncing with my Mac is taking a very long time and then never finishes at the end
If you've successfully paired with your Mac and Syncing is taking forever without ever actually ending with a complete sync, then this could indicate a problem with Sync Services on your Mac.
ToDo Sync Helper logs are available on your machine here: ~/Library/Logs/ToDoSyncHelper
Kindly open the last few log files in that directory and see if you find any of the following lines:
... |ISyncSession|Warning| com.guidedways.2DoSync: timed out waiting for session to begin
or
... |ISyncManager|Warning| SyncServer is unavailable: timed out trying to connect
A proposed solution to the problem has been given in the following link: