Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 347)

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System Administrator Notes
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Background Null 
1=sets to have no background color.
 0=have background color specified under
Elements.
Start Time/End Time Default start and end time range (must be a valid
FactoryTalk Historian string).
UpdateTimeRange Maximum time period, in seconds, to support
updates. The default is 604,800 seconds, equal to 7
days. If the time range is greater than this value, the
trend does not update automatically even when the
end time is '*'. Note that the maximum update range
is different from the update rate, which is the
frequency with which the computer displays new data
from the server, typically every 5 seconds.