It depends on the kind of car and options. I'd say that adding a $1200 alarm system is a really good way to ensure that any car will take a really long time to sell. Unless you get a killer deal, I'd pass it up for another.
I'd say that it isn't really common for a Toyota to sit on the lot that long. On the other hand, the Toyota dealer near my home still has a 2008 Camry Solara that is still brand new and hasn't been sold. I'm not sure why they haven't just lowered the price a bit more. It's a fully loaded SLE V6 with navigation, and they still are demanding $24,000 for it. Nuts.
It sits right out front with a "MANAGER's SPECIAL" tag on it. Special my fanny.