RFB,
Estimated hours is not a good thing for builders, especially first timers, to worry about. Hours are for commercial builders who are trying to make money or for kit and plans suppliers, who are also trying to make money. Since homebuilders usually aren't in it for the money, it doesn't really mean that much.
For suppliers, hours are a way to let customers get a very rough idea of how complex a boat is. It's sort of like the EPA mileage figures - no one actually gets that mileage and it's lower in California, but it gives you a rough idea of which car uses more gas.
And just as there's city and gas mileage, there's also multiple types of boatbuilding hours. There's labor time, which is the time when builders actually have tools in their hands and are working directly on the boat. This is what most suppliers quote and is the smallest part of most builds. It doesn't include getting a workspace set up, maintaining tools, waiting for epoxy to cure, sitting/standing/walking around just looking at the boat and considering what to do next, etc.
There's oops time. Something minor goes wrong and a step has to be stopped, fixed and cleaned up before progress can resume. It's no big deal, and with epoxy stitch & glue it's pretty easy to fix, but it's hours that don't get included in the build estimate.
There's artistic time.Say you decide to add one of those nice onlays CLC sells. That's not included in the build time and can be a susbstantial number of hours if you're working very carefully to make a museum-quality build.
Related to that is finish time, the time spent on the outer .02 inches of the boat. It has no effect on performance, structural strength, weight or any of the things that actually matter on a boat, but it's pretty much the only thing which determines whether a boat wins best in show so some people will spend enormous amounts of time on the finish, most of which isn't counted in the build estimates.
There's also life instrusion time. This can be a big one. Kids get sick, trees fall down, the garage door gets jammed, the toilet backs up, the basement floods, the boss wants you to stay late, etc. Not only does this directly steal from the boatbuilding time, it can also leave a builder emotionally and financially too drained to be able to work on the boat for a while.
Finally, there's what most builders are actually interested in - calendar time. How long will it be between sending out my credit card number and putting the boat into the water for the first time? It should be pretty obvious by now that that's a very individual number that is hard to pin down.
The best thing is to not even worry about it, try to do something every day towards building the boat, even if it's just cleaning up some of the mess from the last bout of building, and enjoy the build process. Pretty soon you'll be looking at the box and see that there's no more bits of wood left to glue onto the boat.
Good luck and don't worry. You'll do fine.
Laszlo