SLA vs Time Taken Chart

I have been asked to plot a chart to show time taken vs a service level
agreement. Both are provided in date format (No time) in a master data
sheet. Basically the task in question has a 48 hour SLA. I don't really
want to edit the master data sheet by adding any helper columns.

I have 2 questions regarding the above:

1. Can anyone suggest which chart would be best for this?
2. Is there any way of doing this without helper columns.


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thoemmes
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