The timer needs to go but just removing it will give way to house flipping cretins. Hell, even if it didn't, imagine what would be required to buy a house, you'd need to race to your choice of ward selector and browse through the wards as fast as you can to get a CHANCE at peeking at wgite numbers and some guy already is racing to that place.

Nah, you need to give people time to know that the house is there for sale. I'd say make it 24hrs and make VISIBLE, byt that would just create a massive click war, every time, which might as well just be a lottery given how random that would be. Also, you'd need some premium Internet to be able to buy a house under those circumstances, giving people equal chances is much better on that case.