I see a lot of opinion about Keep On Racing, but here are the actual situations for Double Length Legs:
AR6, leg 6a and leg 6b in Hungary - teams reached a point where viewers are told that it is To Be Continued, a double length leg. However, there is no effective difference between this and Keep On Racing (a label not used in Amazing Races until AR18) excess there was no finish mat and no first place prize winner
AR7, leg 8a and 8b in India - teams reached a Lucknow rooftop to be told "Still Racing". That sends them in leg 8b to the train station, where them board for a mystery destination which turns out to be Lucknow. There was no prize.
AR8, leg 10a and 10b starting in Salt Lake City, then throughout Utah to Old Faithful for leg 10a, then through Wyoming and Montana for leg 10b. There was no pit stop in between, so this was a "You are still racing. Here is your next clue." leg.
AR8, leg 11a and 11b starting in Montana, then to Montreal, with viewers in suspense on whether the Wheelers would quit finding tickets somewhere in Olympic Stadium. There was no pit stop and no prize. 11b was the final leg of AR8, traveling to Toronto and then on a motorized boat to Joseph A. David State Park where the final ROADBLOCK awaited them.
AR10 leg 9 - teams in Finland found no finish mat but are told to Keep Racing, which takes them to the Ukraine.
AR18 leg 4 - teams finished in Lijiang, China, with the last 2 (Kynt/Vyxsin and Zev/Justin) being told "Still Racing", with the other 7 teams already started on leg 5 and Margie and Luke winning a first place prize.
I may or may not have all Amazing Race double length legs listed above. Whether they are Keep on Racing or just Still Racing is a totally irrelevant distinction for me. I do agree that a prize was awarded on AR18, leg 4, but who cares?