Thank you for getting back to us.
Our system had an unexpected maintenance on these Sunday/Monday, so that is not the time of actual package running but staying in a queue.
We see that 250-280k of records take around 5 minutes in most cases for your package, however the run ID 28415321 with 164330 of processed records took 40 minutes.
Execution time depends not only on Skyvia load but on source/target availability and state.
We suppose the same reason took place for the run ID 28661334.
Should you have any questions, do not hesitate to contact us back.