Mine was split into two but because of weather. I planned for the whole test, we did the briefing and got airborne. Once we got up to the altitude planned for the nav, the visibility was right on minimum. I told the examiner I wasn't happy with the weather and didn't think we should do the nav. He accepted my decision and asked if I was still happy to the GH part of the test which we did. When we landed from this flight he congratulated me on a sensible decision as the weather was significantly worse than the TAFs etc. I felt so much better than if I had tried doing the nav in borderline visibility. Sadly, due to weather conditions, it took us 2 weeks before we managed to get the second flight sorted but I am glad we made the decision to delay. If the weather had been good on the first try then I would have gone ahead with the full test but I have no idea whether I would have passed.