From June 26th to August 20th :

 9am to 7pm, everydays.

From June 18th to June 25th and August 21st to September 4th :

9am to 5.30pm, everydays. 

Booking compulsory in the mean time of opening schedule.  

Free access outside these hours.

Depending on ongoing governement rules about Covid-19, this activity may be subject to sanitary rules.