@Joe Riel Indeed, I was hasty and concluded that was what I was looking for, it realy don't solve the problem of stoping the worksheet execution, incurring in a similar case of break, but only noticed this long after. However, I'm sharing this whorksheet and I was already thinking in something like a pop-up box informing the reason why the calculations stoped brecause the final result would make no sense since it depends on the loop results, so after all it solves indirectly. :)

@vv Thanks, but Carl Love came up with a solution I was expecting. I just have to point out that when it comes to long evaluation times, some times mine take 2 to 4 min (you couldn't guessed it for I didn't mention that) to execute the entire worksheet, your solution isn't quite effective as I cannot tell if the code is still running or hit the point I should stop it (or even got stuck as happened many times during development), nevertheless thanks again for your idea. :-)

@Carl Love Thanks a lot, that was exactly what I was looking for. :)

@Preben Alsholm 
Thanks for the help, it took a little while to figure out how to implement in my worksheet, but everything went well.