This is an EV Grids calculation, not an observation: 530 km at roughly 165 Wh/km needs on the order of 87 kWh of road energy, and the planner keeps a 20% reserve in hand.
A compact (about 40 kWh usable) pack reaches about 195 km before reserve, which puts this leg at about 2 DC sessions. A mid-size (about 50 kWh usable) pack reaches about 240 km before reserve, which puts this leg at about 2 DC sessions. A long-range (about 70 kWh usable) pack reaches about 340 km before reserve, which puts this leg at about 1 DC session.
Split 530 km into thirds of roughly 176 km. One stop late in the first third and one early in the last third spaces the charging better than a single long halt in the middle.
Drive faster, run the air conditioning harder, or load the car and every number above moves the wrong way. Enter your own Wh/km on the planner and it will re-space the stops for NH48 accordingly.