Gemara Brochos Shema Tefillah - http://kollelbokerbeachwood.com
Starting before the Z'man and Concluding afterwards - Brochos 7a
http://kollelbokerbeachwood.com/articles/53/1/Starting-before-the-Z039man-and-Concluding-afterwards---Brochos-7a/Page1.html
Avrohom Adler

 
By Avrohom Adler
Published on 12/28/2007
 
  • Tosfos - if Bilaam would begin to curse at that moment, he could continue.
  • Bais Yaakov - One can have the advantage of a tzibur if he begins with them.
  • Aruch Hashulchan - One can daven after the zman if he started before.
Finishing after the zman