The
journey takes 20 minutes following a winding road up to Machu Picchu with around 25 buses operating the route at any one time, however, expect
long queues
during the high season
especially, and allow at least 30 - 40 minutes to get a bus back to Aguas Calientes if leaving Machu Picchu between 12pm - 2 pm when everyone's keen to get lunch.