Well, we started at 8 and finished at four!!! That makes it 8 hours(with a 45 min break)!!!!!!There’s just so much to Daven for!
If the Davening takes too long for some and you therefore cannot concentrate fully, you should really go Daven in a Shul where they Daven at a quicker pace.
It was just so beautiful, we didnt rush, but we didnt take our time majorly either. We just said every Tefilla at a nice pace, sang a nice Niggun here and there, and hopefully our Tefillos reached Shomayim!