Although, how come over a 72 hour period you're still able to perfectly collect your Libraries but not the Farms? That seems biased to me.
Qaccy,
I should have stated that the intention is to not collect early and therefore in theory get the maximum production.
Here's my example. The 72-hour period was used as a common denominator. 72 hours = 4 18-hour productions = 6 12-hour productions.
Grape Farm
If I start production at 7am on day 1, I will not be able to collect until 1am. Since I would be asleep at that time, I won't collect day 1 until 7am on day 2. At which point a start the second production. Again it completes while I'm asleep and I cannot collect until the 7am on day 3. I start the 3rd production and it gets collected on day 4. Only 3 collections in the 72-hour period instead of the 4 possible collections due to the need for sleep.
It would be possible to collect 4 times if I started day 1 later in the day, but after the first 72-hour period you're back to the above example.
Arcane Library
If I start production at 7am on day 1, I will collect at 7pm that same day. Then I start the second production. At 7am of day 2, I collect the 2nd production and start the third. At 7pm on day 2, I collect the third and start the fourth. At 7am on day 3, I collect the 4th production and start the fifth. At 7pm on day 3, I collect the 5th production and start the sixth. At the start of day 4, I collect the last production. I have collected 6 productions in full and therefore have been able to collect more mana.
Again this is all based on limited space and looking at 14 arcane libraries versus 8 grape farms. Not too mention that I don't have to spend any additional time or resources building the grape farms.
I will state that if space was not as much of an issue, the grape farms are better overall for culture and mana. Also if I can get the Maze of Dark Matter built, I will be upgrading it heavily.
Jps54, I'm glad that culture is not an issue for you. I have just over 48K at the moment, but will lose half of that when I start full on building the Halfling settlement and have to sell off libraries for space.