Though the official opening hours are from 9am to 5pm (Central European Time), the platform is accessible 24 hours a day. When the exhibitors chat timings are different from the official hours, you will see the indication in their chat timings.
You will be able to visit the booth, view on-demand videos, view and download presentations and documents. The representatives might not be available for chat and you might not be able to follow the conference programs with live Q&As. Rest assured though, any past conference programs will be available as on-demand videos.