When running an export of an Ad-Hoc query that contains an Ad-Hoc query, the export process takes a long time to complete or just times out. The Ad-Hoc selection that the Export Process is based off of only takes a few minutes to run. The Ad-Hoc selection in the Ad-Hoc selection the Export Process is based off of, only takes a few moments to run. When run as an Export Process, the delay is experienced.
We are currently evaluating this issue and will update this article when we have more information.