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There are different parking regulations depending on which parking space you are using, so it is EXTREMELY IMPORTANT to read the signage on-site indicating the days/times when parking is allowed, or if it's a reserved space/permit-required area before starting parking and leaving the spot.
Why does the app indicate a maximum parking duration when I want to park for a longer time?
The app displays the maximum parking time because the rules for that particular area dictate that parking is only allowed for a specific duration. The rules for parking duration should be visible on the signs in that area.