How is the Event Data's Sequence Number and Offset created on Event Hub?

Hi all;

I did some tutorial about Event Hub. 

The sequence number and offset of a event look like a auto increament number (+1).

I wonder if the number of event is too big or the event is last more than 7 days, will Azure Event hub delete and reset sequence and offset? If these properties reset, which point do begin ? (From 0,1 ... etc)

Can you help me answer these questions above.

Thanks in advance.