30 min
OK, I slightly underestimated the time needed to finish fingering Shosty 5 mvmt 3. That last 4 measure lick looked deceptively simple, and took me 15 minutes instead of 5. I ended up going into thumb position on the D string to make it sound right. Fortunately, the treble clef section fell into place after the inter-session incubation, so I was able to finish that part in under 10 minutes and have a few minutes for page repetitions before the bell rang.