I have a workbook I have been working on a few hours, forgot to save lately and accidentally did the unthinkable.....

I did a "replace all" on about 30 entire columns, replace all blank cells with zero.... not good. It has been going about ten minutes, I calculated the rate of time to complete to be 37 days....

I dont want to do an "end task" and shut down Excel without saving, anything I can do to stop the process?