I started a job to run overnight on 1000 books. It's been 9 hours and the job has been stuck at 94% for 3 hours. There are some large books but none are dictionaries

. The largest is the calibre user manual which I forgot to exclude.
Is it likely this job will finish running or is it "stuck"? The little wheel still spins and I periodically get a high cpu performance alert. Advice and opinions please.