I would say roughly 52, since there is 52 weeks in a year. Might be 51 or 53 depending on the year, and where exactly the days of the week fall in relation to the start of the year.
It depends on which year it is. As the years come and go, even the calendars do. Use Wikipedia's calendars here [link removed]
This is for 2010 [link removed]
well im guessing as theres 52 weeks in a year that its 52