It all depends on species too.
Wet and green, elm.....that stuff can still have a high moisture content even after being split and seasoning for 2 years or more.
Nothing fancy to measure, but when you throw it on a fire, and it boils/steams water out the ends, it's too wet. And elm does that even after a few years.
Ash on the other hand, cut, split, stack in summer. Burn that winter and have no issues at all.
Been cutting tops from a logged woods that was logged 3 years ago. Summer cutting and splitting is winter's wood. So it had 3 years to season prior to splitting, and a good 6 months after.
Maple....maple is wet. If you don't cut it within the first few years it rots before it drys. Red oak good for a little longer even though the outer white ring gets a bit soft, the red inner wood stays nice.
Ash....Ash is about the best firewood for a seller IMO. Splits nice. Low moisture even when green, means it don't rot fast, and it dries quick. Not as dense as some others like oaks and hickories....but best all around IMO.
So moisture and seasoning time all depends. So there is no easy answer. Some wood dries faster or starts drier. Drying time depend on if left as logs (standing or down), or if split. How small/large are the splits? Etc etc.
I have NEVER had any complaints about wood I sell. Only praise for quantity and quality.
Have had many customers state that "this is the most wood anyone has ever brought, you sure that's only a cord" (yea....many scammers out there that think a tossed on pickup load is a cord....and advertises as such of $95 as opposed to my "true" cord for $160) it just amazes customers. Hard to believe that so many people are that ignorant to what an actual cord is, and just take the deliverers word for it. Have also had customers say they have turned away many loads claiming to me seasoned, when clearly they weren't. Never a complaint.
I only wish I had time to cut hundreds of cords a year, because I have no doubt I'd be able to sell all of them and have happy customers. And run the wannabes selling green junk by the pickup load claiming it's a cord a packing. Just don't have the time or equipment to do more than 20-30 cord a season