flowerbug
Garden Master
I don't know what the bare minium your Fort Portal Jade will need require for light each day but a half hour of direct sun seems very little. I would almost think that would eventually kill them. They are daylength neutral so cutting down on the amount of light they are getting will just make them take longer to produce pods and seed. They will produce a lot less pods and seed if grown in the house.
In 2014 I started one seed in each of two pots of my Dalmatian bean in the middle of April in my west facing slider glass door. I took the plants until about early August to produce 4 to 5 dry pods. They got probably about 4 hours of direct sunlight each afternoon. The pods were slightly smaller but the seed seemed normal size. They probably produces only about 15 to 20 percent of what they would normally outside in the sun all day long. The plants were a little leggy and smaller not as robust looking as the bush plants that grow outside. The pods were absolutely blemish free never having been exposed to the weather or insects and the plants totally disease free never having soil splashed on them from the rain. I watered them like house plants down at the root zone.
i'll put them outside on the nicer days that aren't so roastingly hot so they should be getting more than a little light, it just isn't going to be as much as they would get if left outside. i can shift them to another table and they'd get some more light in the evening in this room but it won't ever be like being outside.
this is very much a learning experience for me, i'm not sure i'll repeat it or not.