Turning in the seed, What reward?

I dont really know if i got this right, but here is what i think.
Example:

I buy 500 BlueCodas with a reward of II for 45.000 adena.
I seed it on mobs with *2 Health and after all of them are seeded i have about 900 Seeded blue codas.
In this case the blucodas give me "Crafted Leather" and the buyback price is 175 adena each.
A "CraftedLeather" sell for 2850 adena in NPC shops.
And this is what i have been told.

If i should have turn in 17 Seeded Bluecodas should i get 1 "Crafted leather" then.
( 17 * 175 = 2975 )

And if i turned in all the 900 seeds i get 55 "Craftedleather"
(900 * 175 = 157500 = 157500 / 2850 = 55,26 )

Is this correct or am i way out there? in that case plz kick me back to were i should be.

Materials cost double the sale price to the shop.

Thus your Crafted Leather will cost you 5700a through the manor. Hence you will get half the material you have calculated.

Out of 900 fruits it would be most efficient to turn in 880, to minimize wasted fruit.

880 x 175 = 154,000

154,000 / 5700 = 27.01

Selling 879 drops you into 26 Crafted Leather retruned.

Thanks really much ! :)
Btw what is the exact Second after 20:00 that the Manor reset? i know it's 5 Minutes + but not exact..

Hehe someone plz tell the exact second missed by a split second and it was all gone

It's like 8-05, 8-06 central.
easyer if you set up your's sell list and then just spam tries to buy some seed (1-2 what ever, just make it fast) and when you buy that crop just klick sell.