Disclaimer: I totaly suck at math. If you discover an error in any of the following outcomes, please feel free to correct me.

HOW LONG DOES BREEDING TAKE?

I tried to keep track of the realtime and find out the age of my fishes. I came up with the following figures, but keep in mind these are approximate calculations.

DATA
The gamespeed was set at 2 times.
From impregnatation 'till birth it took approx. 15 minutes (could be a little more)
From birth 'till adult (20 years) it takes up approx 1Hour and 20 Minutes

CALCULATIONS
1 Hour and 20 minutes equals 80 minutes
in 80 minutes my fish will grow 20 years old
in 40 minutes my fish will grow 10 years old
and so on...

Keep in mind to multiply these figures by 2 if you want to know the 1 speed time setting. For the 1/2 time you double them again.

So for the record:

from impragnating a fish 'till adulthood the total time would be approx.:

1hour and 30 minutes 2 speed
3 hours normal speed
6 hours half speed

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I hope this info is of more value to someone than my postman pat info