Grow account 10% 73 times

This was a modified post by Brian in the forums.  I kind of like it.  How realistic is it?

"Want to have some fun with MS Excel? Below I have drawn what the 1st 4 cells in an excel sheet will read. Put $1000 in cell A1. Cell B1 is A1 plus 10%. In cell A2 put the formula =B1. Now B2 will read $1210.  Now grab the lower right hand edge of each column when it displays a little plus sign and pull downwards, which will copy your formulas downwards. By column 73 you are a millionaire. Now the only question is - how long to grow your account 10% and how long to do it 73 times?

btw, you are going to be wanting to be sitting down if you try pulling these formulas down past row 100 or so. (could that represent 100 weeks?)"

Click on the thumbnail to see my spreadsheet:

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