2L at 2-3 days. Those are 18L pots, but they aren't fully covered with soil (another mistake made at the begining). I water them in the same time, usually in the second part of the day, when I take my work brake. Just a normal bottle, with couple of holes.
But it looks like over or underwater? Anyway, I will back up a bit, as you said.
That seems like a lot of water. I use much smaller containers, 5 1/2 litre pots for the 10 weeks of the plants life.
I only give them about 330 ml of water each every other day and they do fine on that. Over watering is the most common mistake made by new gardeners, even some of us who should know better can get a bit watering can happy. I've other plants I hadly water at all, those Sundae Drivers but they are just kicking around until I can create some space.
These plants are pretty hardy and difficult to kill.
This guy
@BurnzYzBudZz is using similar size containers. Check out what he's doing as far as watering goes. I read a lot of these guys threads and they mention how much water to give the plants, they also talk about "run off" and not to let the plants stand in run off water too long.
I water my plants from below, I have them stood in plastic 1 x 1 metre trays but Ive a lot of plants to take care off and not much time. My lights don't come on until 7pm so unless I want to be up all night I need to be getting in there at 7 and get things sorted. I always try and get them sorted as soon as the lights come on because, firstly, that's when the plants are using it and secondly, I don't want any excess water in there when the lights go out. The extra water will drive up your humidity and that will lead to further problems for your plants, especially in flower.
I'd lay of the water until that soil dries out and then I'd give less more often and at the start of the plants day, which might not be the start of your day. Try and work it out, especially when you go into flower, that you feed, water at the beginning of the plants day. But less is more, remember.
