So putting very little effort into researching - given the life of the tyres at Barcelona, Im thinking that you wouldnt actually get a single flying lap under current F1 regs?
Opening stints were around 8-10 laps when full of fuel. At 4.6km/lap thats 37-46km life in the tyres. With the ring being 22km you'd be going outlap to inlap.
Thats pretty depressing to think of the tyres in those terms.
I don't think they did in and out laps on the full 'Ring. I think they'd take the shortcut behind the pits (or last corner on the new track) to avoid doing the entire thing.