Dear all,
i will visit porto at weekend.
now i having a question to the andante ticket.

as tourist i should use the andante 24 or andante 72 ticket.
my question is now. how long are this tickets valid. only per day or 24 or 72 hour. as example, if i validate my ticket on saturday 14 o'clock pm. is this ticket then valid to sunday 13:59 or only to saturday 23:59 ???

i hope you understood my worst english
although thanks for your help.
take care thomas