Quite a few beginners use free classified sites as a way to build traffic. The problem with free classified sites is that your ad gets buried in a few hours if you are advertising in biz opp niches or other popular niches. So how do you get the most exposure for the brief time your ad is on the first page of results? I have found that early mornings and early afternoon are the best. I'll use a couple of sites like Backpage and Craigslist locally for some products. My personal results are as follow: Monday - Early morning between 9AM and 10AM and early afternoon between 12:30 and 1PM. Tuesday - Again early mornings but for some reason the afternoon is just plain dead. Wednesday and Thursday - The same as Mondays Friday - Forget it. People are cashing checks, buying necessities and looking forward to relaxing. Saturday - I'' place ads between 10AM and noon. After that, everybody is probably out doing their thing. Sunday - Same as Friday. If you are in the "make money" niche you might get a few stragglers who aren't looking forward to Monday morning, but all in all everybody is just chillin. Now the exception to this, for me anyway, is when I am offering a tangible product. then Thursday through Sunday is good as people are shopping online rather than going out to the store. Again, this is just my personal method. Try it out for your stuff and check you stats. Adjust as necessary until you find those peak times for you and your business.