The "Decentralized Culture Bureau of Cusco" has changed the visiting times to the citadel of Machupicchu as of the 1st July 2017.
The two entry periods for visiting are now:
06:00 to 12:00
12:00 to 17:30
The use of a tour guide is now mandatory. The guides will be able to escort groups of up to 16 people.
It should be noted that tickets that have been booked and purchased before May 2 will not have restrictions on the entry and exit.