Hello PrUn citizens!
The official FAQ says
“Many in the community suggest repairing at around 90 days.”
But after some analysis, this advice could be better.
The knowledge is out there but not clearly shown, so here is my take on building repair by heat mapping the material cost vs efficiency to show the total lost production days vs the age of the building. It is pretty clear from this that at 45 days you use material at the same rate as if you waited til 90 days, but you gain 2 to 3.5 full days of production doing two 45 day repairs vs one 90 day repair. See for yourself!
I recommend updating the official FAQ:
Thanks for reading!
-Your friends at Canadian Tire & Ammo [CTIR]
PS. Special thanks to our partners at Ascaron [ASCA] for the inspiration!
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This is a great analysis, I never thought of it that way before.
However, where it gets difficult is where you have a building with, say, 4x BSE and 3x BBH. Now whenever you repair you’re going to be “wasting” some materials, but since BBH is more expensive than BSE then it’s better to align with the BBH, hence 60 days would be the best time.
Given the complexity in practice, I’m not sure that the official FAQ needs updating. The advice as written is not bad for a beginner, and it is difficult to come up with a simple rule that applies well to any building.
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Opportunity cost matters. Personally I agree that 90d tends to be worse than earlier dates, but for newer players with very high rates of return this is likely different. (Edit: Technically the earlier the better. For example an EXT, for optimal results, should get repaired every 11.25 days, not every 45 days.)
A base full of low-tier buildings costs like 2k/d in degradation. What is the opportunity cost in repairing for 90k after 45 days vs for 180k after 90d? Those extra 90k you pay much later can get you 2 or 3 production buildings each producing 2-3k/d. Yes, I’m assuming same efficiency for both repair dates, but the difference is so stark it easily offsets the meager savings of 3.5 production days over 45 days. Say, conservatively, you get 2 extra production buildings for that money, that’s 90 production days added over those 45 days you wait, right?
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This wouldn’t hold true for my one water planet that requires TSH and HSE, where 90D is 35 units each or it would be 70 units if i did it at 45d
Even at 3.5 days production that is far below the extra cost of TSH/HSE
35 TSH is 1,330,000
35 HSE is 448,400
3.5 days of extra water is 10153 units or 355,372.5
- all prices calculated off MOR CX Average.
That said simple places like Montem i agree 90 is not the best, cheaper planets i tend to do more often ~30 days but places that use HSE or TSH or even worse both yeah not a chance that’s a 85-90 day redo.
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I agree with the conclusion that 90 days is bad, but I’ll question the recommendation for a 45 day cycle for all buildings. For anyone looking into in-depth explanation of the degradation system and repair optimization, you might like to have a look at my walkthrough where I explain why.
PS: It also includes an optimizing calculator so you can see for yourself 
I have to admit, thanks to the BRA box, I just repair stuff when it drops below 99%.
@MoonSugarTravels, I’m adding your calculator/guide to the handbook. I hope you’re ok with that.
We do real-time game, yet building is damaged after 90 days???
In real world, buildings last at least 10 years with little to no maintenance.
In this game, 90 days later one pays 1/2 of new building to repair it :o)
Boy, I have rebuild my flat already three times, and I paid barely 1/3 of market price in last 20 years :o)
How about adding some realisms in real-time game?
As a real-life investor, I own no company that buys asset that cost more to maintain that it earns 
Metric known as ROIC (Return On Invested Capital). Every business owner expects to earn money with PPE (Property Plants Equipment).
One pays 1M for a base that costs 500k to repair just after 90days. What real-life scenario simulates this game?
“Real-time” isn’t really the correct turn for the game. It is persistent and not turn-based, but people say “real-time” because it is more succinct. If you were to insist on actual real-time gameplay, your rockets would take months to transit between planets, maybe weeks if we allow that the engines represent super duper atomic rockets. The time-frame of the game is an abstraction based on gameplay, not realism for realism’s sake.
As far as building depreciation erasing profits, the margins on most commodities are good enough that a player would have to majorly mismanage their company not to profit, even with the current depreciation schedule. My least-profitable base cost ₳1 million to build but produces profit of approximately ₳40,000 daily. Over 90 days, that’s about ₳4.6 million. If you subtract the construction cost and ₳500,000 in depreciation, we’re still looking at profit of ₳3 million over that period. As a pretend investor, I don’t see why you think this simulates an unrealistically bad investment.
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