The oldies board being what it is, there's a heavy emphasis on the distant past. Say what you (or I) will about the board's obsession with by-gone days, they do come up with some interesting factoids.
LMAD and Hollywood Squares each experimented with an hour-long format for a week in 1975. LMAD was week of December 1 and Hollywood Squares was week of November 3, the same day TPIR went to an hour full time. Wheel also experimented with the hour-long format the week of November 3 and would go to 60 minutes full time on December 1. It reverted to half an hour on January 19, 1976.So now you know about hour-length formats in the 1970s, in case you ever wondered. The thread eventually does get around to ABC's current Sunday night block of 60-minute shows. A poster points out that each show is really just two half-hour eps smushed together. It's like watching a double run of Celebrity Name Game or Jeopardy (to name a couple double-runs in my local DFW market).
A 60-minute format can feel overblown and slow, as sometimes happened with, say, Fox's Greed or GSN's Money List or TBS's recent Separation Anxiety. But to be Captain Obvious for a moment, a 30-minute format can dawdle, too, if the gameplay isn't well-designed.