Some questions about quota

Hi

Can you help me? The log file tells me a statistics (per week), but I have
been using your service for more than two weeks ago. Why doesn't want the
counter reset
itself then? I'm not afraid, because I have much quota left (about 275).
But just a question... How long does the 300s quota for? For a week, for a
month, or how long time? 

Thank you for reply: McMacee 
(student from Hungary, who has only Email access by a foundation and who is
interested in computing)
Your service is really good and nice, so please don't stop it.