Why does it need to be 2 hours long? Why not break it up into various videos? That would make it far easier to watch and to produce.
I don't know who your audience is for a 2 hour vacation video, but you're better off splitting it up into different sections. Either by date, location, event or genre. It will make it far more palatable to anybody wanting to watch.
IF you break it up there is absolutely no issue at all and the computer will fly.