Superleg

Season 6 introduced the first double-length "superleg" shown over two episodes. The televised episode ended with a 'To Be Continued' message instead of a Pit Stop. The second half of the leg featured a second Detour and second Roadblock.

Occurrences
Seasons 7, 8, 9, and 18 each had a superleg with teams meeting Keoghan on the usual Pit Stop mat at the halfway point, only to have him hand them the next clue instead of checking them in. In Season 10, the superleg did not involve meeting Keoghan, but rather teams were informed to "KEEP RACING!!!" in their next route marker. In addition, the 2-hour finale of Season 8 took place over a superleg similar to Season 6's. The first leg of Season 18 was a superleg, but the first team to arrive, Gary & Mallory still received an Express Pass from Phil.

Clues
Generally, the clues leading up to these longer legs are easy to identify because the teams will read a clue like "Go find Phil at the mat" instead of "Check into the next Pit Stop." While there was no set rest period between the two parts of these legs, there usually is some point for the teams to eat, rest and recover prior to the second set of tasks, either due to waiting for hours of operation with provided accommodations or a long train or plane ride.

"To Be Continued"
"To Be Continued" legs appeared to be born out of sheer luck during Season 6. Leg 6 in Hungary was originally planned to be two legs, with a non-elimination point (with the stripping-of-all-cash rule in place) between the legs. However, the producers discovered during the race that begging is illegal in Hungary, which would have made it nearly impossible for the last place team to acquire the money needed for the upcoming leg, and quickly devised the extended leg to mimic the effects of a non-elimination leg (keeping the same number of teams in the race), and using a simple video message clue to provide teams the goal for the first task of the second half of the leg.1