The issue isn't speed, it's comparative speed within the same story. Speed of Plot is an excuse but that doesn't automatically exclude it from resulting in a plot hole.
Personally, I'm not happy with the lazy excuse that warp drive has improved to an extent far in excess of what was possible 100 years in the future. If it did, it could only be scans of the Narada that was the catalyst and if the Narada's technology was the basis for the research then the Narada's speed should rival the Federation ships (top speeds may vary but that isn't relevant to the issue we are discussing).
As far as we know, the Klingon Empire isn't suddenly dozens of light years closer to Vulcan than it used to be so Nero must be travelling very fast. If Nero can travel from Klingon space to Vulcan in a day with a stop-over to collect Spock then he can travel Earth much faster than that. We know the distance that Kirk has to travel to reach the outpost on Delta Vega and this gives us a rough idea of the amount of time he spends walking (plus an unspecified time being unconscious and an unspecified time talking to Spock and Scotty.
As I said, the fact that Enterprise arrives in time is a plot contrivance. The fact that Nero travelled slow enough for that to be a possibility at all is a plot hole. Lots of things could have delayed him - interrogating Pike, repairing damage, blowing up the much closer Andor on the way, fighting off Earth's defences, stopping off at Starbucks for coffee etc but none of those are specified in the plot - so it is a plot hole.
Personally, I'm not happy with the lazy excuse that warp drive has improved to an extent far in excess of what was possible 100 years in the future. If it did, it could only be scans of the Narada that was the catalyst and if the Narada's technology was the basis for the research then the Narada's speed should rival the Federation ships (top speeds may vary but that isn't relevant to the issue we are discussing).
As far as we know, the Klingon Empire isn't suddenly dozens of light years closer to Vulcan than it used to be so Nero must be travelling very fast. If Nero can travel from Klingon space to Vulcan in a day with a stop-over to collect Spock then he can travel Earth much faster than that. We know the distance that Kirk has to travel to reach the outpost on Delta Vega and this gives us a rough idea of the amount of time he spends walking (plus an unspecified time being unconscious and an unspecified time talking to Spock and Scotty.
As I said, the fact that Enterprise arrives in time is a plot contrivance. The fact that Nero travelled slow enough for that to be a possibility at all is a plot hole. Lots of things could have delayed him - interrogating Pike, repairing damage, blowing up the much closer Andor on the way, fighting off Earth's defences, stopping off at Starbucks for coffee etc but none of those are specified in the plot - so it is a plot hole.
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