DDobinpilot
What does your Stage 2 invitation e-mail say? I don't think they have stopped using the Wombat test, though apart from that your projected Stage 2 itinerary is pretty accurate. Stage 3 also includes uniform measurement and a briefing, though these are not assessments.
ap_797
480kts = 480nm in 60 minutes = 8nm per minute
Therefore it takes approximately 2.25 minutes to fly 18 miles if your GS is 480kts. As always, use an estimate to make life easier for yourself, so you could probably use 2 to 2.5 minutes as your answer.