Group money is paid out once a day, so tonight/tomorrow morning it will pay out. Note that it will pay everyone that has the Pay Liabilities ability, so if this is a group with many people, make sure not everyone has that ability -- which the Everyone role has by default.
I saw the part about removing your friends from the group after my initial reply, so you did good there. If you and your alt both have the Pay Liabilities ability, each of you will get half the 80K.
FYI for future transactions -- when you set a plot of land for sale, you can choose 'sell to anyone' or 'sell to specific person'. So if you set it to sell specifically to you, you can then set the sale price at L$0 and not have to worry about bots.