HI Excel Programmers!

Here's my problem: I need to insert VBA code into an Excel Macro which
will loop a command (excel's "calculate") until a certain cell
(containing a sum) is greater than 1250. Here's the issue: the spread
is so complicated that it requires 4-5 minutes of calculation (on a
very fast machine). Here's what I need done:

1.) calcualte cells (calc takes 4-5 minutes)
2.) (after calculating cells) read the value of cell G3 (this is a
formula result)
3.) If the VALUE of cell G3 is greater than 1200, then stop and just
sit there
4.) if the VALUE of cell G3 is less than 1200, then calculate (loop)

Here's what I've got so far (hey it's a start!)

--------------------------------------------------------------

Sub Macro7()
'
' Macro7 Macro
' Macro recorded 6/3/2006 by *

Calculate
End Sub



Many thanks to anyone who can help!!!
-Frank Bosco