Can anyone help me here? Also tried that with Postman and disabled limits. Here I could see in the monitoring, that to fetch 30.000 lines it needs 10 minutes.
The screenshot shows that the API-calls can be extremely slow. This has been observed in Exact Online Germany before. Best is to check the execution time in Session I/Os. When values above 10 seconds occur, you might want to reach out to Exact Online API Support.