What time do I have to arrive with a flex pass?

Flexibility to arrive up to 2hrs prior to or after your selected start time (subject to opening times of event)  • For full event public hours, please visit www.vangoghchicago.com/hours • Flexibility to change the date & time of your booking to a PEAK/OFF-PEAK date & time of your choosing  • Subject to availability and must be requested a minimum of 72hrs prior to your scheduled attendance.  • Maximum of 2 changes per order permitted.  • To request a change of date go to https://vangoghchicago.com/reschedule/

I just had "off peak" /weekday but it was suggested 20 minutes before