OP is in a very dry and hot climate near Athens, Greece. And if I remember his previous posts this is A. macrorrhizos.
Which can be grown in full sun in Texas..
So he is not misguided to give it a few hours of sun . It is a hungry feeder and in habitat grows near streams and can even stand in water. When grown in ground it can push out a leaf a week and get to 12 feet :). It loves hot and steamy with daily drenches ..
with all the heat (97F in Athens now and will only get hotter ;)) and 25% relative humidity during the day..it can and probably should be watered in a pot daily..
and due to frequency of watering should be fertilized often, probably more often then he does now.
So..I suggest light watering in the morning to wet the medium following with 2nd watering with fertilizer diluted to half strength weekly. The medium should be porous enough to drain quite fast. It should be a fast grower too. And leaf evaporation will be high in such dry and hot conditions, so basically you can't water it enough..
In all fairness you can't compare it to growing orchids :).
@wandering_ant, I suggest that you go to your profile and in location add 'Athens, Greece' so it shows up with your posts: it is necessary for giving appropriate growing advice.
