Myself, once a week.
There's no correlation between your gambling frequency and the results you get.
I mostly bet on sports, sometime there's a week where an underdog win more than favorite, sometime there's a week with full of unpredictable results. It's random and depend on how lucky your predictions is.
Once a week isn't really bad way to go, limiting your engagement can actually mitigate the losses you might incur. Some might not be a fan of this type of gambling because they believe that gambling once a week might reduce your chances of winning which is why they prefer to gamble on a daily basis expecting that any day might be their lucky day. As we all know gambling is a game of chance and luck, reducing the time you spend on it might not actually matter but it's the best thing to do in order not to get addicted to it.