When you create a Stress result, instead of taking the default of All Bodies, select the door body. That way the Legend will autoscale to the highest stress in the door.

Don’t plot the maximum stress at the End Time, select the Maximum over Time.  I can’t recall if that is the exact wording, but pull down on the list and you will see it.

How many output frames did you request in the Output controls?  The default is 20.  You can increase that to 200 to get finer resolution of the time history.