I'd say the opposite is true. I normally don't have time to peek in until at least meal time. However, this may not be applied to die-hard GoNer or someone who is seeking for a particular item.
Based on my experience buying and selling using the Internet for the past 5 years, I really don't think the "When" matters. Instead it is always the "What" and, most of all, the "How Much" matter the most. As long as you have a desirable item with reasonable asking price, people will find you even if your ad is buried among thousands of others.
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