Upgrading Land Level for increased Bronze production, might be a bit too much with current rates...

I did some math & estimations based on my personal Bronze production (3772/h).

The cost of +1 level upgrade = 74 min of my current Bronze production (from KT).
74 min x 100 upgrades = 7400 min (*123 hours / 5.125 days*).

If each upgrade always costs exactly the same amount of Bronze... and always provides +0.007%... then at max lvl it should reach +0.7% (0.14% total) - essentially doubling production of said land (hopefully)...

- Current production: 515 bronze per 24h.
- New production: 1030 bronze per 24h.

In order to restore back the invested 462,900 Bronze (to cut even & finally start making Bronze profit), we divide that amount by 1030.
This gives us ~449 days - of a non stop production, without changing land purpose even once.

And if we count-in a purpose change every week, for a Weekly Distributions - that will be ~705 days.

Few additional notes:

• Since we can't see exact values anyway (since the game often rounds numeric values), for simplicity most of presented numbers are rounded too.
• The calcs were made assuming the costs of upgrading levels will not steadily increase.
• I didn't verify if KT level affects the upgrade costs, but given the exponentially nature of this game; I'd assume it does increase the costs.

Presented example is based on a Wood Land - results with any lower-tier land than this were only worse (so I assume with a higher tier lands results should be a little bit more on a positive side).