Helsinki public transport ticket validity
I found at https://www.hsl.fi/en/tickets-and-fares that Helsinki area offers tickets valid for several days, from 1 to 7. Unfortunately I cannot find information if those are valid for that amount of time or for that amount of calendar days (so, for example, if I buy a 1 day ticket on Friday evening, can I use it until Friday midnight or is it still valid on Saturday afternoon)?
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