Ad Money, and how to use it

Hey there, I’ve published around 3-4 different games, all of them have done pretty okay, nothing crazy but I’d like to know how you guys spend ad money and how you go about it. I believe ads are very important, so I wanna know how you guys use ad money, do you use it all in 1 day, all in 2-3 days all in a week, or how do you guys go about spending robux for ads?