Here's the number of "shows" (Phil uses this term to refer to single legs and halves of a double-leg) including tonight's episode:
13x11 (Seasons 1-11) + 11x2 (Seasons 12-13) + 12x11 (Seasons 14-24) + 7 (Season 25) = 304
So in TPTB's counting system, only four of the past previous TBCs have been a single leg.
There's therefore two ways to spin it:
1. It is only a TBC when Phil tells you "the leg of the race is not over." So it's considered one long leg in Seasons 7, 8, 9, and 14, but two legs in all other instances (including when teams don't meet Phil).
2. It's a new leg whenever Phil tells you your position. So it's two legs even if Phil tells you "the leg is not over," but one long leg if you don't encounter Phil, or if he doesn't tell you your position.
Show | | Location | | Informed by | | Instructions |
6.6 | | Eger, Hungary (ad-hoc TBC) | | No indication | | - |
7.8 | | Lucknow, India | | Phil | | [No placement] You're still racing. This leg is not over. |
8.10 | | Moran, USA | | Phil | | You are the first and second teams to arrive. However, this leg of the race is not over. You're still racing, and I have your next clue. |
8.12 | | Montreal, Canada | | No indication | | - |
9.3 | | Moscow, Russia | | Phil | | You're the first team to arrive. However, this leg is still not over; you're still racing. Here's your next clue. |
10.9 | | Helsinki, Finland | | Clue | | KEEP RACING!!! |
14.10 | | Beijing, China | | Phil | | You are the first team to arrive. [Unaired prize] But guys, this leg of the race is not over. You are still racing; here is your next clue. |
18.1 | | Sydney, Australia | | Phil | | You are the first team to arrive. [Prize] But you guys are still racing; here's your next clue. |
18.4 | | Lijiang, China | | Phil | | You are the first team to arrive. [Prize] You can enjoy that after the race but right now you're still racing. |
19.9 | | Brussels, Belgium | | Phil | | You are team number one! [Prize] Now, as the first team to arrive you know what that means: you'll be the first team leaving on the next leg of the race. And the next leg of the race starts right now. |
22.3 | | Windwhistle, New Zealand (ad-hoc TBC) | | Phil | | I'm very pleased to tell you that you are the first team to arrive. [Prize] Guys, the race is still going; I have your next clue. |
23.4 | | Svolvaer, Norway | | Phil | | You are team number one! [Prize] The other news is that you are still racing. Rip it, read it, and keep on racing. |
Edited: To add on, we've had 15 double-show episodes and 2 recap shows (Seasons 6 and 7), meaning we're at Episode 304-15+2 = 291!
2: Hong Kong > Sydney > Coober Pedy
2: (Finale) Auckland > Hana > Sausalito
3: Grindelwald > Montreux > Singapore
3: (Finale) Ho Chi Minh City > Hoi An > Seattle
5: (Finale) Manila > El Nido > Dallas
6: (Finale) Shanghai > Xi'an > Chicago
7: Vicente Casares > Johannesburg > Makgadigadi Pans
8: Quepos > Fountain Hills > Page
11: Stone Town > Warsaw > Krakow
15: (Premiere) Los Angeles > Tokyo > Cai Be
18: (Finale) Zermatt > Niteroi > Pigeon Key
20: (Finale) Kochi > Osaka > Waikane
21: (Finale) Palma de Mallorca > Chenonceaux > New York City
22: (Finale) Edinburgh > Belfast > Mount Vernon
23: (Finale) Bandung > Tokyo > Juneau