this is always required sir, but you can make it dynamic, and let the user choose the time.
this is a search on which time duration eamil you want to see else, there will be like 1000s of email which overwhel our app.
So, i think hubspot with this parameter wnat user to limit the duraitons of email which user want to see. like just this week or yesterdays email. thats why we need to pass this parameter.
you can make it dynamic and let user choose the time duraiton.