1st Goal Prices In Footy

Experimenting with a few systems for betting and trading. Could anybody on here give me a rough idea how long into a game it takes for 1.15 in 0.5 goals market to get matched, or if an early goal, 1.5 goals market. I know it varies from game to game but looking for average times. Is there anywhere I can get info on the stats for this?? Any help much appreciated.