Those are crappy peacetime figures. They were thrown overboard in 2003 even by the U.S.Army and that was overdue.
Formation leaders who lead from their Schwerpunkt (up front) were able to make on the spot decisions and turn around their formation or a big chunk of it in much less than two hours.
The allowance of days for preparations should be a relic of the days when front lines were established and defended. Formations had to be much, much more agile even back in that long gone age once the front line was penetrated.
Feel free to allow 6-96 hours if you want to recreate France's disaster in 1940.
A German armour Corps was expected to move about 300 km in 96 hrs and to defeat several rifle divisions on the move in '41.
Vehicle cruise speeds were increased by about 50-75% since 1941, communications gear has been improved - modern peer vs peer mobile warfare could easily exceed the gold standards set in WW2 by 25-50%.
Month, Year?
Guderian led mostly from up front, so his Corps orders were quite often "follow me" messages. The important decisions were made at the advance party (Vorausabteilung) which was in his direct reach if not direct control.
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