Maybe it's like in those old season of Amazing race where there was a midpoint check in.
Like in TAR 6, in Budapest
From wikipedia:
Leg 6 was a combined double-length leg, with two Detours and two Roadblocks, shown over two episodes. The placements listed in the first column reflect the order teams arrived at the Net Klub Internet Kafé, the leg's halfway point. The leg's Fast Forward was offered after the halfway mark, and thus permitted Lori & Bolo to skip only the second set of challenges.
(It's the only one I can think of, but I'm sure there was more of that)