Hi! This is very individual, depending on the combination of light and temperature of the house, and also on whether the pot is plastic or clay. I read a lot like String of pearls is a succulent and needs a lot of light and little water. But my experience is different at all: bright direct sunlight is not necessary and the soil in a tiny clay pot dries out very quickly. So I water 2 times a week in the summer, one of them is adding fertilizer. I made a soil mix with ordinary soil from the store, plus vermiculite and lechuza pon. But your conditions is different, so just try different things and look what’ll happen. And good luck!

I don't keep them in the sun in summer, but do during the rest of the year for a couple of hours (morning) otherwise they get leggy. I'm causiaus with watering because of root rot, but the plants outside don't seem to care to much when they get wet. I let the soil dry, but don't let the pearls srivel. I keep them in plastic pots, and with one plant I noticed they can root pretty deep (10cm). I think maybe my soil it too airy, I use cactusmix + perlite 1:1. And maybe my soil is too acidic (PH 5-6), that's were lechuza pon would fit in. Do you use perlite to suck away to much water or because you use clay pots? Thanks for your response.@@selfmadebotanist

I don't use perlite. I think clay pots play a big role in watering, with them it is rather difficult to get root rot and overwatering. In my experience String of pearls like much weather to form new beads.

I meant vermiculite in my last question instead of perlite. But reading your reply, you probably use it to retain moisture without the roots getting too wet.@@selfmadebotanist