Be aware that:
- there is a technical limitation on how long route can be, see Too long route bug - #22 by t00thl355 (not a bug, actually a limitation)
- the longer the route, the longer the recalculation takes. If I am riding 400km on one day, I do not need the 3000km of the route to be recalculated every single time I deviate. That is how recalculation currently works.
For me, keeping the sections to 1-3 days works fine, but some other users may prefer to plan longer.