Until such a moment when Maria waves goodbye and expects you to say something back.
If you would like to read more about other ways of saying goodbye and of finishing an email in Portuguese, you can read the last part of a newsletter I wrote a while ago following this link: I hope this helps Mark.
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Quero a conta, por favor Meaning: I want the bill please.
And if you want to improve your Portuguese going forward, I do suggest you and and some traps it hides.
I will probably at least initially be based in Lisbon, and actually talked to one school or after school program about volunteering and they seemed interested.