Hard to count time, i work some hours at evenings. That i remember, the temporary carcass of library's trunk stands on desk more than month. Then called me to an exhibition less than 2 weeks before event and i completed Library with 1 1/2 weeks.
Only telescope i completed later:
One pony i will to do from zero to complete in one evening with 3-4 hours:
Last week of sommer vacation i did every evening one pony:
Tont afraid of some imperfections, they are very small, only 17mm or 3/4 inches tall. Twist have less than 1cm / half inches tall: