You have some control over what you export via Tools/Export Management/Mange Export Filter, but it shouldn't matter how you get to the records to export and using the report Wizard should be fine for the filtering you are doing. You should include observation/obs key in the ouput, but you don't need anything else for the export to work. Is it the report or the actual export which is taking the time. When you get to the Export window which Export Type are you choosing ? The best one is NBN Access Database zipped.
When it fails what is happening. is it stopping a particular point.
I ahve just run a test doing a zipped file export from a report wizard report. It took 1 hour to export 250,000 records.
Mike Weideli