We'll keep it simple... on Bushka's production...
1200 lets assume, because that is all we can do, 500-600 are titlists... most of those are very plain, in fact some are Hoppe's, some just have black collars and delrin caps, some are split and jointed with no collars. He did not have to glue blanks, I believe Burton supplied them already rough turned. Early cues were French polished, not finished.
How quick can a house cue be converted? Or just keep in mind, most of his cues are plain. His shafts were purchased pre-turned..
Plus the guy was a machine, from all accounts. He didn't have to read the internet, and read second guessers. He didn't have to argue about his cues, or contribute to forum wars to justify his cuemaking. All his time in the shop, was for cue making.
85-90 cues a year is not a stretch when you have all the above to factor in. There is another unknown cuemaker here in NJ, that GB liked, in fact sold him his shaft seconds. He said GB used to bring 5-6 "extra" cues to tournaments to sell.
Don't underestimate a guy who is committed, and excels at his craft. Just because you cannot do it, doesn't mean it can't be done
It is a a completely ridiculous estimate...if we chop down his work hours to a solid 8 hours of fully undivided work attention 5 days a week with no days off as I said sick days, holidays, personal days, it works out to 1 cue per day for 13 years think how absurd that is!!!!!!!!!!!!!!!
Any modern custom maker would laugh if you told them they had to finish one cue a day for 13 years (by themselves with one lathe and a bandsaw) ......let alone make 10 or 20 in a day which would have had to have been a possibility by your insane estimates..... Numbers DO NOT LIE. PEOPLE DO!!!!
Furthermore let's use the top end of your estimate of 600 "simple" cues
That leaves 600 (supposed) cues left (many of which were quite complex)
Working 12 hours a day for 5 days a week. He would still have to make 1 cue every
1.81 days for 13 years MINIMUM!! to get to 1200.