The time is rather minimal considering. On one of my sites, it's 30 days no matter what and the minimum amount is 5 dollars. Depending on how dedicated you are, you could get enough to cash out within 3 days, and then have to wait 30 days just to see that 5 dollars. And even if you do bigger increments, it's still 30 days. So, really, this "it comes the 20th" isn't so bad in my book.
So, I'll gladly wait for my $30 check to come considering I'm just watching TV and clicking on links while I do it. It will become routine once you get a few more cashouts under your belt, it's just that first one that makes it seem so horrible cause you still don't know whether to trust the site or not. Don't worry. As long as you don't break any of the TOS rules and stay active, those checks will keep coming.