It really depends. Some buyers are looking for a unicorn and may have seen a lot of horses but not had one fit every box. It seems that the less horses the person can afford to have the longer their search tends to be. For instance, since I have the land to spare I can buy a horse that might not be perfect and be ok to get another. But when I was boarding, it was much more essential I got the perfect horse.
As a seller, I have had amazing horses sit for over a year due to them not being desirable in some way (OTTB, red mare, etc). I just had my OTTB sit for 3 years between leases because no one wanted to look at him since he was a plain bay teenaged OTTB gelding The woman who just leased him sends me messages almost weekly about how amazing he is and sheās have great success in the show ring.
But, any horse thatās super desirable that sits for a long while tells me thereās something wrong there.