2001 was not cut for time. The trims were mostly fat, and for redundancy. A cut had to be delivered for opening. Same situation with Zhivago, which was re-cut over a 12 week period. IMHO, Lawrence may have been cut twice. At least that's as I recall the facts. But I have grown old. And long for the hanging gardens...
I don't remember Lawrence of Arabia (216 min.) being cut during its roadshow run. Neither was Exodus (208 min.), also from United Artists and much longer than Mad World.
The Ten Commandments was 220 minutes and Paramount never cut it to "squeeze in more shows," and that didn't stop it from becoming the highest-grossing movie of the entire decade. Ditto for the 212 minute second-highest-grossing movie of the decade, Ben-Hur.
The ones that were famously cut shortly after beginning their roadshow engagements, besides MW, were Cleopatra and 2001: A Space Odyssey. It wasn't as common as you think for these things to be cut. Some were cut for "popular price" general release, such as The Greatest Story Ever Told (that one needed at least three hours cut out, in my opinion), and Star! (which was even given a different title), but that's another story.