They are one of the most unproductive manufacturing nations in the civilized world....

They get a mandatory 35 hour work week, 4 weeks vacation a year for just being hired and more statutory holidays then any western country....
Public holidays
Fixed Public Holidays
1 January - New Year's Day
1 May - Labour Day
8 May - Fete de la Victoire 1945 (WWII Victory Day)
14 July - Bastille Day
15 August - Assumption of the Blessed Virgin Mary
1 November - All Saints Day
11 November - Armistice (Remembrance) Day
25 December - Christmas Day
26 December - 2nd Day of Christmas (Alsace Lorraine only)
Moveable Public Holidays (dates given are for 2003)
18 April - Good Friday (Alsace Lorraine only)
21 April - Easter Monday
29 May - Ascension Day
8 June - Whit Sunday
9 June - Whit Monday (Pentecost)
It is wise to avoid doing business in France during August, when there is a country-wide closure of most businesses.
It is also worth noting that when a holiday falls on either a Tuesday or a Thursday many French workers take the Monday or Friday off. This is not official and generally does not apply to institutions such as banks or government, however it is sufficiently commonplace to cause difficulties in doing business on occasion. The practice is called "faire le pont" (bridging).
Wait!! Maybe they know something we don't...

Regards,
Badger
ps: If you do business with them, you have to be prepared to dish out a lot of under the table money (second only to Italy) as a "promote fee". We call it graft, they call it just part of doing business.