If Landlord Sells Home, How Much Time Do Tenents Have To Move Out?

Kindly ask him for an extension or If you like the home, can you afford to buy it? Ask him if/when he gets a bid on the home can you move out then? With this economy being the way it is it may take a long while before he can sell anyway. Negociate with him telling him that you will keep the house extra neat so he can sell it and that you will keep the house available when people want to come and look at it. Having you there will save him the extra trips to getting there. All the while you can save and look for another place to live.
I wonder why he rented it out if he was contemplating selling it a couple of months later.