I don't know much the complexities of printers and various print jobs...enough to do my job but pretty much feel like I'm a Flintstone in a Jetson world.
It DOES seem that those last minute docs are sometimes scanned and are in a very sloooooow-to-print format. My printer usually prints 25-30 pages per minute but I had very late set early this week that took an hour and 20 minutes to print 2 sets of 138 pages. Late and the slowest set ever. I was about ready for a straight jacket. Fortunately, the signers were patient and had their first attempted closing 2 weeks previously called off by the notary because she also had late docs, etc. problems and couldn't change her schedule, so they didn't want another failed attempt. Those super-slow print jobs have happened in maybe 1 set out of 50. But have always been in late docs.
With all the extra prep I put into docs (lots of sticky notes with instructions...) so they can be signed from at least 6 feet away, usually in a dark garage or outside in the weather (twice snow in the past week) I need a minimum of 3 hours before signing to have docs available, and that's assuming that I'll be home and not at another signing.