Every day Jack and Ted have about 5–15 minutes to go outside and play table tennis in the afternoon. As their free time varies each time (sometimes it's 5 minutes, sometimes 10, sometimes 15), they always agree before the game about how long their game is going to be. Though it's the time that is really limiting them, they still prefer to take their scoring in the game as their limiting factor (it's not a big problem for them if they finish one or two minutes before or after their free time is over). So, each time before the game Jack usually asks Ted, 

1. "What score are we playing until?"
2. "Until what score are we playing?"
3. "What score are we playing till?"
4. "Till what score are we playing?"
5. "What score will we play until?"
6. "Until what score will we play?"
7. "What score will we play till?"
8. "Till what score will we play?"
9. or... What question would you ask in this situation?