Time tracking records are stored within the TimeTracking table in Method. For QBD, Method retains a specific number of days of transactional history (this is to limit the size of your database). By default, Method only retains the past 31 days of transactions, after which, the transactions are removed from Method (though they will stay in QuickBooks).
the number of days of transactional history to keep within Method and perform a full sync, you'll find that your transactions from prior months will become visible.
The setting can be found via the QuickBooks Tab -> Synchronize Tab L ink.
Let me know if you have any further questions about this,