Ideal CPA x 50 events per week minimum divided by 7. That’s on the low end. If budget is not a constraint, then I’m looking at audience size and trying to spend as much as possible without driving up frequency too quick, which i have a rudimentary formula for, like 1. 2m reach, in my mind i think to myself $120 a day, times 2 max = $240 a day. Anything higher than that is going to run up frequency rather quickly and first time impression ratios will drop quick as well. It’s just a basic rule of them i use when determining budget. I want campaigns to last months, not weeks/days.