I counted worked tiles with

/

on them to assess the impact of the Golden Age which is coming in a few turns (t215 or 216). There is 161 population in 58 cities, currently working 204 tiles, of which 107 have

and 175 have

. GA would add 282

/

is started now. That would have brought revenue from current -30 to roughly +250 gpt. This is not quite as much as I need.
Feudalism and Machinery are both worth 3185

(Feudalism is bit less brecause Darius has it), Guilds is 4550

, Banking - 3185

. That is 14105

in total. At 250 bpt it will take 57 turns. Since I have only one library and no

buildings the gold/beakers convertion rate is almost exactly 1:1. Hence, for the purpose of my calculations

=

.
After taking Chicago I had 3215

, there will be some 3000

from MoM. Then there will be conquest gold. This is difficult to estimate, lets go with 1000

. I also expect some 1000

worth of Feudalism Darius. That would cover 8215

, cutting research time to 24 turns. This is still too slow: 215+24=239 turn Banking. I knew that with all the misfortunes and more focus on expansion than I initially planned Banking would be pushed to later dates but t239 is ridiculous. It has to be no later than t230.
So far I haven't considered growth and expansion. Most of my 58 cities can grow 1 size about every 5-7 turns, adding roughly 40*18/6=120 population by t230. Some 20 pop will be conquered, perhaps more. And there will be some whipping. I definitely need a couple more galleys, a few settlers, workers and courthouses. That will require about 20 2-pop whips. That brings
rough estimate of increase of popultion to 120+20-40=100.
Some of these new citizens will work 3

0

0

farms (mostly in GP farms that need fast growth), but most tiles will have

or

or both. There are some unused cottages and Calendar resources as well as a few golds, irons etc, ignored because I'm currently focusing on growth. I think 3 to 4

per pop on average is a reasonable expectation. Thats 300-400 more

per turn by t230. With linear projection it means (250+(250+350))/2=425 average gpt, or (14105-8215)/425=14 turn of research (t229 Banking).
There is still Moai. With a bit of chopping I could have some 2000

from it and shave of a few more turns, but would leave Taj the only wonder convenient for Wonderbread. I think I'd rather keep it for latish but more massive failgold. I might not even have enough workertuns for that.
A few pics just to remind where the game was left. Comparing Financial to Organized: the latter saves 88

in maintenance, the former would add some 70

. It seems that Organized is stronger before even courthouses and expensive civics come into play. Of course, I still have less than 3 pop per city.