R shiny front-end is stopping working help me

When I run the Application everything is normal everything is perfect everything is processing, but when I move away from the application I mean I will get out of my Laptop for a few hours, when I go back to mess with the back-end actions, why not answer me?

Hello,

I'm afraid your explanation of the issue is very vague and I don't understand what the exact problem is. What is the purpose of this Shiny app, and what are you processing that needs to wait for a few hours (in Shiny). Are you running the app locally, or on a server? And what you mean by "mess with the back-end actions"?

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PJ