by jimbobo2779 » Wed Oct 09, 2013 12:07 am
Number of proxies needed is tied to how many search threads you want to run and whether you are going to be limiting by PR. I always advise to start with 1 search thread per 5 proxies and increase gradually from there. Proxies will be usable for as long as they are rented, if you are using public proxies the duration of their usability will range from just a few minutes to maybe a few days (it is rare that they last longer than hours).