Loop and screen update (or debug log update)

I have a for loop going on, with for loop inside, and another inside... they are calling few other functions, also with for and while loops. Anyway it takes about 10 to even 400 seconds on my computer to finish, depending on data input. Loops are in void, not on update, I'm using C#. The question is - can I do something to receive Debug log message, or some UI update DURING loops? Because unlit loops work, screen is on freeze. And I would like to know about progress (and not by stopping Debug in monodev)?