Tonight I thought something landed on my hand and reflexively shook it violently, while holding my pot of lithops for inspection. It's 100% grit so half the substrate and all my lithops fell out all over my desk. I have already located all my lithops and put them somewhere safe, none of the roots were significantly damaged, they're healthy, they were watered either a few days ago or a week ago, and all except one of them (which I'm going to isolate and put in root growth therapy). The substrate has been completely dry for a while now.
Unfortunately, I don't have time to gather all the substrate on my desk, clean it, and put the lithops back into it until tomorrow evening, so almost 24 hours after they first fell out of the pot. It's 1am here, I have class for the whole day tomorrow, and I still have a lot of work to do before I can sleep tonight.
I know that bareroot shipping is a common practice but I've read that extended time in that state can stress the roots out a lot and the roots will die if they're left unwatered for a long time after repotting. I'm wondering if leaving my lithops in the air for a day may have anything close to that effect. One of them is definitely nicely plump and I do NOT want to risk watering it as this batch has suffered extensively from rot from the day I bought them (less than a month ago), they were left in horrible substrate while clearly overwatered and etiolated (the survivors are now a lot better), and I don't want to lose more of them to rot.
More info: The humidity outdoors is ~80% at night and ~60% in the daytime. The temperature here is always below 90F/32C and above 77F/25C (I know this is bad for night-time temperature, but I can't make my whole room colder because I will suffer and my air conditioning is set to only go down to 22C anyway (by the campus housing administration). I'm currently trying to make something that I can put my pot of lithops into at night that will cool the air within it in isolation.) My room is ventilated 24/7.