Reykjavik to Blackpool is my longest . I think this is about 870 nm. There was a good tailwind and we were high up in good weather so we thought we would miss out the refuelling stops. Landed with lots of fuel.
I had thought that having 1000 nm range meant that I would never fly that far but have plenty of spare for cockups. Having been to Greenland I now think you need an aircraft with 1400nm range (and a bit) in order to avoid every having to spend another night there.