从c＃Winform运行20分钟的Excel宏

We have a macro that takes approximately 20 minutes to complete. We've got a c# winform that our user has access to - it contains a "Run Macro" button. I'd like it so that the user can hit the button and then actually close the form and then in 20mins time see the output from the macro in a pre-defined directory.We have a macro that takes approximately 20 min