Best way to get a ton of players for a small range of time with ads?

I’m currently working on a video that will need a large number of random users inside my game. I want the most amount of players I can get with my budget for around 5 hours. My budget for ads is 20k Robux.

Does anyone have advise for how much my max bid should be, or anything in general for what I’m trying to do?

(note I don’t care about how the game does after the 5 hours)
Thanks!