Inspired by the LiChess "French leave" question:
In a standard time-control you can think almost two hours about your move, and even two-and-a half or three if you blitzed beyond the 40 move control. Personally, I recall the one or other opponent of mine thinking a whopping hour about a tempting sacrifice I allowed them to make - bad idea, they regularly lost when I produced even more chaos on the board and they wished they had more time to analyze :P
Thus, my question: What is the longest reported time for a single move under 2h+X/40? (Including Fischer bonus, what argueably makes this even easier. Non-OTB is allowed too, which has the advantage of the data being explicitely recorded.) Tal's "Hippo incident" comes to mind, and Sämisch was an expert for this in almost every game. Still, I lack concrete values.