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I've a huge amount of PDFs accumulated over 25 years and some copied off bought DVD and CD archives. These are mostly service manuals organised by brand directory and datasheets of components organised by device type. There are also many PDFs of technical magazines from 1920s to 1970s. I'd not dream of putting that in Calibre or on an ereader. Most of the PDFs I've imported to Calibre are scans of novels out of print and not available as ebooks or old 1930s to 1960s scanned technical manuals. Some PDF instruction manuals for complicated to use things.
None of it is worth trying to convert to PDF and most of it would need OCR. The instruction manuals mostly have text and images but not worth converting as the diagrams are too small on less than 8" eInk.
So I'm curious as to what sort of PDFs you have and why you'd spend time converting them rather than using a 10" or larger LCD tablet, 8" Sage or 10.3" Elipsa (I know the Sage has more dots, but the text or diagrams can be too small on larger technical PDFs or magazines). Really most of the scanned old magazines would need more than 13" screen, so I read them on a 23" 4K monitor with two page display in the PDF reader.
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