The Kollel wrote-
(a) One gives ...
1. ... a Besulah - seven days of Sheva Berachos.
2. ... an Almanah who marries a Bachur - three days.
3. ... an Almanah who marries an Almon - one day.
Kesuvos 007: Sheva Brachos for a Bochur to an Almanah<<
I think I may have spotted a slight error in the Review Questions and Answers #8a. According to my understanding of the gemara, a Bochur who weds an Almana has the full 7 days of sheva brachos. It is the requirement of Simcha that is only 3 days.
Please do let me know if my interpretation of the gemara was wrong.
Boruch Zidell, Brooklyn
Seeing as the Takanah of 'Shakdu' refers to an Almanah, when the Gemara concludes that a Bachur has seven days for Berachah ..., a Bachur who weds an Almanah has seven days of Sheva Berachos, just as you said.
I apologize for the error. Thank you for pointing it out.
Be'Virchas Kol Tuv,