How far is Merzouga from Marrakech?

About 560 km — roughly a 9–10 hour drive across the High Atlas.

The route crosses the Tizi n’Tichka pass and passes Aït Benhaddou, Ouarzazate and the Dadès and Todra gorges, so most travellers split it over two days. Treat the drive as part of the trip — it is one of Morocco’s most scenic roads.