39 weeks
April 8, 2012 is exactly 17 weeks after December 11, 2011.
2011 was the same in Ireland as any other part of the world. Having 365 days, that is 52 weeks and 1 day. In terms of measuring Sunday to Saturday weeks, or part thereof, then there were 53. Taking week 1 as Sunday 26th December 2010 through to Saturday 1st January 2011 and week 53 as Sunday 25th December 2011 through to Saturday 31st December 2011.
8.6 weeks
Exactly 11 weeks after December 20, 2011 is March 6, 2012.
A lot
A little over 21 weeks from 1st December 2010 to 1st May 2011.
26 weeks and 1 day.
43 weeks and 4 days.
From the date of this question 26 April 2011, there are 10 weeks.
52 weeks rounded up.
3 Weeks to Daytona - 2011 was released on: USA: 1 December 2011 (limited)
52 weeks.