Firstly I would like to state that I am impressed by the efficiency of German engineering, the cleanliness of German cities and countryside, the beer and the sausages! (And sauerkraut if mixed with juniper berries and apple sauce).
now I can't speak as to lengthy tea sessions, being a dedicated coffee drinker, however I have a hypothesis that the FD mugs, rather like the Hutton Truckers Mug, are quantum coupled to the ship's fsd and bleed some of the jump energy through into the liquid contained therein. So for lengthy coffee sessions an Elite mug is a very sound investment. However the annual Canonn meetings can drag on a bit, especially when the fig rolls have become sticky through storage at too high a temperature, hence I find an insulated travel mug valuable to have as a backup.