I think I was on that flight!
Okay, if this was the QF183 on 30 July (and it sounds like it is), then it isn't that much of a beat-up.
As a passenger, this is what happened:
About 30mins prior to scheduled landing, the seatbelt sign goes on. People were still lined up for the bathrooms, which is pretty usual.
The pilot attempts to land at Queenstown, but the winds are terrible, and the plane is really being thrown about. Generally, I like turbulence (I find it calming), but this was the scariest landing (or attempted landing) that I have been on - something about seeing a mountain outside your window as the plane is jumping about does that. (A passenger in row 3 or 4 had a blanket over her head, and was weeping out loud!)
So there's a good 10 mins or so of that, we can see the runway, about to land and the pilot pulls the plane back up. I'm really glad that he did.
About a 5 to 10 minute wait, and the pilot announces that we are going to land at Christchurch instead, about 500kms north, a not insignificant flight, and certainly enough time to turn the seatbelt sign back off. I think he said it would be about 40 mins of flying time. It is probably 30 minutes before we start to descend, and 45 minutes before we land, and another 5 minutes to the gate There was little or no turbulence during all of this time.
And yes, I was busting to use the restroom also! Really busting. I even asked the steward if I could really quickly use the restroom, and he (quite rightly as the sign was on) said I couldn't. There really wasn't any turbulence during this 30 minutes before the second descent, and I can't see why the sign couldn't have been turned off. I actually felt quite sick, and was sweating. Thankfully, I didn't have to use the sick-bag....
In the end, it was probably 75 minutes from the time the seatbelt sign went on, until we were allowed to use the restrooms. That doesn't seem like long, but keep in mind that most passengers were expecting to be on the ground in 30 minutes, not 75, and like myself, took that into account.
When the sign finally went off, I was in row 1, so I raced in first. We were kept on the plane while they were deciding what to do with us for about 20 to 30 minutes longer, and so there was a continuous long queue to use the restrooms. To their credit, the flight crew had to wait in line like everybody else.
So, yes, it was very uncomfortable.
And, we were bussed from Christchurch to Queenstown - about a 90 minute wait from arrival, and approximately 8 hr bus journey.
Sorry if I have shared too much.....