To the OP:
In case these extensive replies seem overwhelming here is a simpler answer, deviation from the box conditions is an adjustment of film contrast and also partly to ensure shadow detail is recorded. This is optional and may not be needed in many situations. Also image contrast can be adjusted when making the print.
The box speed and standard development will take you a long way in the photographic journey of landscape photography, it is safe to start there.
PS the Ilford data sheet for FP4 includes details for processing at different speeds and in a variety of developers. This kind of hard information provided by the manufacturer is always my first point of reference.
https://www.ilfordphoto.com/amfile/f...roduct_id/690/
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