And you can feel the leavesgetting soft before they wrinkle. If the leaf is firm, don't water. As it dries out it gets softer. Easy!
CW
I do exactly this with mine in the winter. When the leaves loose some turgidity, water...otherwise leave it alone. The leaves will turn dull if you leave it alone too long. It will bounce back even then, but ideally you want shiny leaves that feel plump.
That said, I do that in the _winter_ when the plant is resting. In the summer, when I want more robust growth and to thicken the trunk, I water away! Most succulents are opportunistic. They don't have "flushes" per-se. As long as you can keep the conditions in the happy zone, they tend to just keep right on growing. I have a pair of 20 year old saguaro cacti that I ran an experiment on for their first 10 years or so. One I watered by "convention". I let the soil dry between watering, tried to follow all the rules in all the books, etc...The other I watered constantly as long as it was "in growth". The one I watered constantly grew about 3 times faster than the other one.
Same with Jade. I make sure my soil doesn't become muddy or collect water. If I can squeeze drops out of it after it has drained a few minutes, it's too water retentive. I water mine by drenching with a hose every day. But only do this while it is actively growing! Once the temps start to drop, I go back to the turgidity method.
My wife (then girlfriend) got me my jade for Easter in 1991. My very first plant and I still have it. Multiple copies of it these days. We were space limited for many years so I would cut the tops off and throw away the base
Cuttings root readily. Fallen leaves root readily all on their own right there in the pot. Pretty much the only thing that can kill it is too much water so be careful if you opt to follow my habits! Even if you water too much, if you can catch the rot before it climbs the entire trunk, you can cut the healthy part and report just the healthy part. Even a single leaf can be enough to save the plant!
This is my largest "cutting". The last time I broke up the plant I decided to keep some of the bases instead of the tips. I have more room now and am curious how fat I can get it. We saw one in Indianapolis at the conservatory with a 6" trunk!
They never really get much of a root system...at least the way I've grown them
This cutting has been happily growing in this tiny pot for 2 years now. They are very tolerant of low light so I kept this one at my office desk pre-covid. When grown in low light they do tend to get spindly and have a hard time holding themselves upright. But they take a long time to die off even in low light. And, if you're okay with a spindly snake plant, they can survive that way indefinitely. When moved back into brighter light (careful of sunburn!) they bounce back!
In 30 years, I've yet to get mine to flower though
That's something I'm starting to put some active effort into trying to do now. I've never really tried to flower them in the past.