If I did it correctly, I get about $848,865 a week including my bonus multiplier. I have put my goal to 7.5 million instead. It should take me just over 7 and a half weeks to get it. I'm not going to save up to that all at once. I will save to 2 million, spend 1 million, save to 2 million again etc. I'm ignoring the extra row of land Gamer said about for now as I don't know a definite price for it all. Hopefully I will have all the land in about 2 months!
Edit: might take a bit longer as we might have an event update during this time.