The ticket is valid from the moment you first check in until 4 am after the last day of validity (the validity period is 1, 2 or 3 days depending on the type of ticket). The day starts at 00.00 hours (midnight). Example 1: if you check in with your 2-day ticket at midnight on Wednesday, your ticket is valid until 4am on Friday. Example 2: if you check in with your 2-day ticket at 20:00 on Wednesday, your ticket is valid until 4:00 on Thursday morning.