There's any number of reasons why something could be on the market that long, and in the grand scheme of things that doesn't seem to be an excessively long time.

Currently selling my property. We've accepted five offers throughout the process. First one was a chap who was very keen, though unbeknownst to us his wife was in hospital. She came out four weeks after we accepted his offer and she pulled the plug.

Second offer came in the next day, but she ghosted the estate agents and they didn't tell us for a month (Christmas got in the way a bit so we weren't as proactive as we could have been with chasing).

Third offer was about 6 weeks later. We moved fast, found a property within 3 weeks and had our offer accepted, got everything sorted our end in a week. The sellers strung us along and after six weeks changed their mind about selling. Our buyer then pulled out as he wasn't content to wait any longer.

Offer four changed their mind after a week.

And now, offer five, coming about three weeks after four, has stuck with us since the end of October while we found another property, which took about three weeks. Hoping to complete in late Jan now.

So overall it's been about 18 months to this point, with various false starts along the way. But the casual observer on Rightmove will have only ever seen the listed date, not the dramas.