Answer:
They can play for 1 hour and 20 minutes from the beginning of the game.
Step-by-step explanation:
Start playing with 17 players.
At 1 hour, there are 14 players left.
At 1:05, there are 11 players left.
At 1:10, there are 8 players left.
At 1:15, there are 5 players left.
At 1:20, there are 2 players left, and play stops.
They can play for 1 hour and 20 minutes from the beginning of the game.