Bo T
There is a big difference between the kits made by the big factories like Pedersoli and the small muzzleloading parts suppliers like Track of the Wolf's "kits".
The big factory kits are basically made from production parts which have been removed from the manufacturing cycle before they were totally finished.
This means the threaded holes are finished, the dovetails if any are cut and the mortises for the lock and trigger are almost finished.
You would need to do a little final fitting of the parts, do some rough and finish sanding of the wood, stain and finish the wood and assemble it all.
This would take anywhere from 20 to 40 hours depending on your skill and how well you want the parts to look when it's done.
The "kits" offered by the small companies consist of a a stock which is roughly the shape of the finished gun with a barrel channel and ramrod hole drilled.
All of the parts like the trigger guard and buttplate are just rough sand castings which will need to be filed, sanded and polished.
The lock is usable but the screw holes to hold it into the stock don't exist.
The stock will have a LOT of wood left all over it to allow a builder to modify it to the shape he wants to end up with. This means a LOT of wood will need to be removed.
None of the holes for screws exist so they will have to be located, drilled and threaded.
All of the mortises (if they exist) are just rough approximations of what is needed so the lock, trigger, side plate etc will need to be finished to fit the existing lock.
In other words, these are basically a box of rough parts which all need to be finished, located and assembled.
To build one of these guns you will need to spend at least 100 hours of time.
You will need tools for measuring, drilling and threading steel and wood parts.
On the positive side, these kits are the best way to build a unique, accurate reproduction of the guns that were made back in the 1700-1850 time period.
PS: I wrote the above for rifles/smoothbores but basically it also applies to single shot pistols.