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Sorry, but I don't think that this kind of device hasn't an option like this.
Read the manual.
If there is nothing about that option - i guess it won't work.
I guess you refer to the "Auto" feature of the display brightness. Unfortunately this delay is fixed. But if you don't want to set the display brightness to "Low" permanently, you could use the "Sleep" function, which automatically dims the brightness for the time the radio is running in sleep mode.
Grüße
Ben
--
"Obi-Wan Kenobi. Obi-Wan... Now, that's a name I've not heard in a long time. A long time."