They're doing two tables, 100bb buyin per session with auto topoff. Two hour sessions with the option to continue longer. Several session per week - maybe 3 or 4? I think there's a buyout option after they've played half the hands.I see these detail listed in the video details:
Daniel Negreanu and Doug Polk clash on High Stakes Feud at the PokerGO Studio in Las Vegas for an epic $200/$400 No Limit Hold'em Heads Up showdown! A total of 200 live hands will be played during this session before Negreanu and Polk take it to WSOP.com to play the remainder of their 25,000 hands challenge.
Are there other details released, such as min/max buy-in, automatic top offs, clock limits, etc?
Came across this Run it Back today. The H.O.R.S.E. tourney when Scotty gets drunk. There are some tech issues but it's still worth a look..
(741) Run it Back with Nick Schulman | $50,000 H.O.R.S.E. - YouTube