3.0 hrs
What a pain. Fitting the VS is a challenge, thanks to instructions that could be more clear.
Trimmed the front spar on the Vertical Stabilizer. Then clamped to the aft bulkhead. Required very little adjustment to get it normal to the HS. The HS was at 0.0 degrees to the deck, which was level with the forward fuselage. So it should all be in good shape.
Drilled the VS to the 912D elevator stop. That's what the instructions say to do. But it became clear that the 912D should be drilled and bolted to the aft deck first. The instructions failed to mention that, I looked for this step for quite a while. Maybe it was much earlier in the build.
Once you've got the 912D bolted to the VS spar, you don't dare relax the clamps, but they're in the way of drilling the 912D to the aft deck. Arghh.
Got it done, but what should have been 45 minutes turned into 3 hours.