I admit I haven't ever tried this myself (i.e. move a huge stack
at riding speed with only one noble). However, based on my reading
of the rules, I would expect that the maximum penalty *would* be
twice the walking rate. The relavant rules quote is:
The additional delay is capped at a maximum of twice the
original route distance.
I take "original route distance" to mean the number printed in the
turn report (which is the walking rate), which is not necessarrily
the same as the rate that any given noble will actually traverse
that link.
So I would have thought that the maximum penalty for travel into
a mountain region would be an additional 20 days, regardless if
you were walking, riding, or flying.
-- Please use bron-oly2@bronze.corp.sgi.com for Oly2 correspondence. Use bron@sgi.com only if you require fast response. These statements are my own, not those of Silicon Graphics.