This is right. It should be 40.

But.

I found out that the circuitry itself acts as a huge capacitor compared to this one.

I replaced it with 58 pF and threw away my calculations. Now it's time
to experiment....

I am using it ratiometrically but the same value doesn't seem to exist two times.

Code:
Wert:
	ADCWert = 0
	Trisa.3 = 0
	High Porta.3

	;Pauseus 800
	
	
	Trisa.3 = 1			
	WHILE Porta.3 = 1
		ADCWert = ADCWert + 1
	WEND
	Trisa.3 = 0
	Low Porta.3 ;To make UC = Vss
	Pauseus 100 ;To make UC = Vss
	RETURN
Somehow the capacitor has to have time to charge, having a too high value for Pauseus doesn't affect the measurement, it makes sure that the cap is surely charged. But here I cannot know when it's surely charged, but this must be more than zero.