Up until 2023, the Super Randonnee was a 600km route, with over 10000m of climbing, with an extended time limit, to be ridden as a Permanent on a date of your choice. This option is still available, and is administered by Sophie Matter, and her Club, Provence Randonneurs. You can get more info at this link, or from the Audax Ireland Committee.
From 2023 onwards, Audax Club Parisien has revised their Super Randonnee 600 rules to over 8000m of ascent (as measured by Openrunner) in the standard 600 time of 40 hours, to be ridden as a Calendar event.
Event Name: Connaught XTRM 600