A typical marketing time, even in what one might call a "good" market, for your property could be over one year. Then, I'd wonder about the actual "marketing" that has taken place. If marketing has only been what we might call ordinary, combined with the nationwide poor markets, your property could easily take a couple of years to result in a market sale.
It is very possible the land is under-improved as well due to your comment regarding house sizes being twice or more of yours at a competitive lake.
Perhaps you should reconsider selling. I've begun to question if the highest and best use of the land is single family residential, hence the marketing issues versus the results. There is a lake attraction with no attraction facilities to make the lake an accessable enjoyment stop for the public. I'd be asking if the location is prime for the regions highway routes for some sort of public attraction making it an income property. Perhaps you don't need a home owner, you need an investor with vision.