I'm in the US so I haven't seen the movie yet, and can't comment on it's specifics, but I think travel time has easily been one of the least consistent aspects of the entire franchise. So any travel time issues in this movie don't really worry me at all.
Yes, I understand where you are coming from and I agree. The new travel time from Earth to Klingon homeworld is about 2 minutes... does this concur with the rest of the franchise movies/eps thus far? I think not. Its unprecedented. Except for Star Trek V which is universally derided and dismissed. (Centre of the galaxy in 6 hours)
In TOS' second pilot, "Where No Man Has Gone Before" the Enterprise was at the rim of the galaxy. They visited the centre of the galaxy in "Magicks of Megas Tu" and STV. In "That Which Survives" the old Enterprise covers 1000 light-years in 12 hours at warp 8.4 - they'd have made Voyager's journey in a month! In "Conspiracy" the Enterprise-D warps 900 light years in a flash. In Star Trek: First Contact
, the Enterprise-E jumps from the Romulan Neutral Zone to Earth in the space of a scene break after listing to the Borg battle. Compare that with "Balance of Terror" and "The Neutral Zone", where the RNZ was so far out that messages took days to reach Starfleet and back.
It's wildly inconsistent - but IMO since it's happened so often before, it's a valid for Into Darkness
to use the ultra-fast speeds too. No transwarp, just speed-of-plot.