Bet on which 10 minute interval will see the first goal of the match. Note that 09:59 is the 10th minute. Note also, that 49:59 is considered the 50th minute. etc.

Betting Options:
1-10 (same as 0:00-09:59)
11-20 (same as 10:00-19:59)
21-30 (same as 20:00-29:59)
31-40 (same as 30:00-39:59)
41-50 (same as 40:00-49:59)
51-60 (same as 50:00-59:59)
61-70 (same as 60:00-69:59)
71-80 (same as 70:00-79:59)
81-90 (same as 80:00-89:59)
None (no goals)

Example
If the first goal is scored in the 24th minute, then the winning market is 21-30.
If the first goal is scored in the 67th minute, then the winning market is 61-70.
If the first goal is scored in the 47th minute, then the winning market is 41-50.
If the time on the clock is 10:53, then the winning market is 11-20.
If the time on the clock is 60:37, then the winning market is 61-70.
If no goals are scored, then the winning market is NONE.