Question about using "Exchange Scope" activity with the "ExchangeService" variable


I would like to ask how does the activity Exchange Scope connection to Exchange works.

If I save the output variable “ExchangeService” from the “Exchange Scope” activity to a variable and use it later in the workflow, passing it to the “Existing Exchange Service” argument of the “Exchange Scope” activity to send emails using the activity “Send Exchange Mail Message”, is there any danger of the connection expiring during the workflow?
Is it safer to pass the user and password to the “Exchange Scope” activity instead of using the “Existing Exchange Service” option?

My process needs to run for 13 hours. Can I use the “ExchangeService” variable trough all this time?

I’m currently working with UiPath version 2019.10.4 and UiPath.Mail.Activities version 1.7.2

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