That's true, but the most successful course of action with 99% of women is to appear to not give a fuck. They build all these scenarios up in their head when you don't call, and more negative ones than good ones so that they're "not dissapointed" when you don't call. Of course, this is a lie to themselves and they're concentrating actually on the positive outcomes. When you do call after a couple days, like at least two, you've let the seeds germanate in her mind for all the positive and negative, and when you call after all that, they forget all the negative scenarios. The only time it's failed me was the time I actually forgot and called her back after like a week h:

Of course, there are exceptions, but those are few and far between, and you will KNOW, not question, that it's OK to call the next day.