I am using Vectorworks 2019. I’ll try it in 2020 tomorrow.
I exported a bunch of sheets, 97 to be precise, to PDF with that boxed unchecked. It took a couple of minutes.
And then I selected all sheets in ‘publish’ dialogue window and changed exporting format from PDF to DWG/DWF.
But this time I have no control over weather I want to update viewports or do not and Vectorworks graciously update them all for me.
Probably my exporting options are poorly optimized but it took two hours to complete exporting.