Regarding the time the markets are filled with orders is not in our hands.
EDIT: We create new markets every 10 minutes based on the basic pinnacle feed. It usually takes not more than 15 minutes for the market makers to fill them up with orders. So you should find every eSport market on Pinnacle after a maximum of 25 minutes. Did you experience something else?
Not sure, but 25 minutes is probably too long for eSports:
1) A common format (at least in SC2) is a 4 player group, where the first two players play each other, then the other two players play each other, and then there is a loser's match and a winner's match, and lastly the winner of the loser match plays the loser of the winner match (perhaps this is called tournament format). In this case, the lines for the first 2 matches can be created in advance, but you need to keep up for the other 3 matches.
2) (this is relevant for all esports i believe) When there are multiple maps/rounds in a match, sometimes pinnacle only opens the market for the first map ahead of time, and opens the others as they go. In this case you also need to be updated frequently.
I'm not sure how they do it, but nitrogen is better in this regard.