A mountain overnight is not required, but it changes the rhythm. If you stay below, protect enough time for cable cars, walking, and a non-rushed descent.
Measure the route in energy
Stone steps, elevation, crowds, and weather matter more than a simple distance estimate. Pick a route that fits the least experienced walker in your group.
Keep sunrise expectations flexible
Sunrise depends on weather and timing. Treat it as a possibility, not the only reason the trip succeeds.