It's early spaceflight though. Space is still somewhat the wild west. In Enterprise, it took 4 days to get there, which I thought was actually fast. So days, yeah but hours? I found that a little... hard to believe.
And... are there any more ships left in Star Fleet? Sheesh the first movie blew up most of the fleet. This movie took out all the captains and admirals. Then Enterprise leaves Earth for its 5 year mission and leaves Earth unprotected.
Ever see a show called Stargate SG-1?
It's easy to believe. It's a straight line flight. Why should it be slow as in days? Hell, on Stargate they were going to another galaxy in 2 weeks. Why not here?
They blew up most of the fleet?! I could have sworn most of the fleet was at the Laurentien Cluster playing a show of force. But well... if a half dozen ships makes of the fleet or most of it as you say...
Oh yeah, if we learned one thing from Trek over the decades... only Kirk and ship named Enterprise can protect the Earth. Vulcan no, Earth yes. I guess Andoria, Telor and a bunch of classic alien members of the Federation got kacked since Kirk was not on the job yet with the Enterprise. After all... all the others died in that room... except Kirk... Spock... Admiral Bastard... and no other ships could go there in the time it took to rebuild a much fucked up Enterprise and protect the Earth.