@Chris-3u It depends on how you "construct" your holiday.
What you can do is make an outline of a, let's say 5 days, trip on one route; This roundtrip only contains the guestimated main routepoints; starting and end points, and main places to visit. With the new MRA calculator it is now very easy to build such routes and cut the whole journey into e.g. 300 km stretches for each day. The final version for 5 days has maximum 15 waypoints.
Keep that route (R0 - Outline), split the route in 5 seperate routes (D1 -D5) and start detailing each route. That usually leads to the route becoming longer :-).
With the "add routes" function of the routeplanner, it is very easy to copy a fully detailed trip back in the R0 and delete the few overlapping routepoints from the original R0. As you progress, you have your full journey calcualted in the R0.