Unless you found a glitch that makes winning consistent, that category would legit just be gambling no? The only glitch I can see being used is just npc door opening to get into the casino in the first minute then you just gamble and pray. Not really much speedrunning in that.

Uploaded a any% run of 2:09 more time can be saved. How would you go about saving time on going for straight meth instead of any, is it not locked behind Shirley and Warehouse?

Meth% but might just be Main game according to rules lol. On that note got a 2 hours 39min time on all main missions in one setting (Last one is "We need to cook") Could 100% be done faster but just to get an idea of the somewhat timeframe of a full run, and the prerequisites. I did not film my attempt sadly so RIP that WR.