Book time depends on which book you look at. AllDataDIY shows .9 hours for both ends (or .5 for one), and to add .3 hours per inner. Doesn't include alignment.
Book time according to the stealer is over 6 hours, because they "have to drop the steering rack". The only reason I called them is because I couldn't get the end to budge on the passenger side, and the locknut was frozen on the driver's side.
I asked one of my co-workers, whose father owns a used car lot, who to go to for tie rods. I called that guy up, he quoted me just under 2 hours. I took my own parts there (Federal Mogul/TRW/Moog), they installed in about an hour and 45 minutes, good as new. He showed me the old rods and ends. The ungreasable original ends were shot, pretty loose, and the inners were completely hosed up. The nut end was flopping all over the place like it was its job to do so. Absolutely no pre-tension left whatsoever (I found this same thing when I got one of the ends from the knucle a few weeks earlier).
Oh, and they couldn't get the passenger side end loose, either. They had to cut it off (not that it mattered, since they were replacing the whole assembly, but I think they wanted to be able to work on the inners without the end flopping around).
Bottom line, if you're doing the work yourself, get the tool, and replace all 4 "pieces" while you're in there. If you're planning on buying new tires in a few months (but not right away), get a "quickie" alignment to get the toe re-set, and then get a full alignment when you get your new tires. Otherwise, get a full alignment after you're done replacing the tierods.