well. it also depends on the product. you have the usual seasonality such as BBQ sets in spring and woolen socks in autumn... and from there probably another thousand or so. if you really want to focus time -- four minutes before lunch break, six minutes before off work hours, fifty minutes before midnight. those are the same times that chinese ad companies use.
but. there are far more decisive ways to determine your product line. bribe an ex-aliexpress project manager. slip us$3400 into the hands of a dinodirect marketing manager. ask him for an excel detailing best sellers going back 10 years. that is how a chinese person himself would go about it.