How many days should a theft charges be filed?

Question is unclear. If the question is asking how many days to you have to file a report, there is no standard answer. The quicker the report is filed, the quicker it can be investigated with a view towards solving it. The longer the time interval between the occurrence and the report, the more difficult any solution becomes.

ALSO - unless the report was delayed by some reasonable cause, law enforcement tends to view with some doubt, 'tardy' reports of alleged criminal events.