Totally depends on the soil recipie
You could take a cheap nylon stocking or some cheese cloth, load it up with a few cups of your grow media, “water” it and put it somewhere to sit. Feel the weight of it and when it feels dryer, poke around and see if the middle is too wet while the outsides are too dry.
Avoid a cotton/thick sock, cotton retains water like a mofo.
Ya know… I’m going to do this myself today if I have time to stop at the dollar store. Next couple weeks would be a good time for me to do this same “study”.
Broscience update. Nothing mind blowing but I’m learning something.
Made three soil recipes to test samples, threw one of each in a Dixie cup with 4 holes in the bottom, and another (Dixie cup measured) wrapped in cheese cloth. Measurements by volume/parts (ie 2 cups this, 1 cup that)
Dirt1
~26% FFOF
~26% Sunshine #4
~48% Normal Perlite (same grade/size as the premixes)
Dirt2
~70% FF/SS4 equal mix
~30% Normal Perlite
Dirt3
~65% FF/SS4 equal mix
~20% Normal Perlite
~15% #3 Perlite (avg size of 1/2 pieces)
I picked up some cheese cloth and chunky perlite (size #4, but since I was doing small samples I broke/classified it down a notch to ~#3). Mixed up the batches, soaked them by gently submerging them in a large bucket, filled with about 3gal of tap water and a micro drop of dawn dish soap. After gently holding it in the water bucket it was gently placed under a citrus bush outside in a 24” planter I haven’t watered in almost a week and has a known/familiar drainage/drying rate.
The solo cups confirmed what I found with the cheese cloth samples, except the cups took an extra 3 days before I was satisfied the test had run it’s course.
By the end of day1;
Dirt1 was named Mudball (relatively, and to my surprise).
Dirt2 was Timmy and
Dirt3 Bubba
Mudball was too wet inside the cheese cloth sack for a cannabis plant to be happy, except for the immediate 1/4-1/2” layer on the outside under the dry cheesecloth. Excess water had drained well and thoroughly, this was just being held like a dense sponge.
Timmy felt a joy through and through for a plant to be in. Not dense sponge, but damp sponge. If he was going to have Goldilocks over for dinner and Netflix, he’d probably breeze into 3rd base before the 7th-inning stretch. Cheesecloth was damp, drying but soil under wasn’t as dry, and the moisture also felt evenly distributed in the sample.
Bubba was good. He felt a little lighter than Timmy, I suspect Bubba had more rapid drainage. Bubba also has likely better aeration than Timmy with some expansion noted. The other two samples, when picked up and weighed in my hand fit the feel/shape of my handful the same as at start. Bubba did not, Bubba noticeably grew that fit. The gentle fingertip squeeze did caused this sample to crack like an egg under the cheese cloth, so I stopped fondling it, gave it a gentle squeeze to undo my disturbance and put it back down. Bubba’s moistness and distribution felt just as good as Timmy, only a little tiny weenie bit lighter (but also remember, it felt bigger in size too, so… *shrug*)
Day2 finished up the test for me about, I had learned more than I was hoping.
Mudball was still a crispy shell with a caramel center on the inside. Ok, that’s slightly exaggerated. But, the cheesecloth and outer layer was the crispiest and dryest (media going dusty). I’d estimate the the middle 70% by mass was still as wet as it was 30 minutes after being submerged in the bucket. This surprised me, he had the most perlite by volume!
Timmy was good but kinda ready for the spa. Not dry, felt light though and ready for water by weight. The sample in hand felt good and moist, broke the bag open and it was even through.
Bubba was Bubba. I swear he may of grown another 2%, but so minuscule this time that it’s bullshit unless I break out a scale and measuring tape. Now weight wise, it felt even again with Timmy. Fingertip Squeeze caused it to crack in 3 pieces this time, but again, it’s not dry. Broke it open and it is even moisture distribution.
Anyways, it’s helping me, hope it helps others. Only a true stoner could be so entertained playing with dirt at my age.