Every feed I'm aware of contain multiple entries, so perhaps average the time between posts as a baseline to check? Perhaps add an upper limit to one/hour and

Every feed I'm aware of contain multiple entries, so perhaps average the time between posts as a baseline to check? Perhaps add an upper limit to one/hour and a lower limit to one/week? That way, a person who starts posting more frequently will be checked more frequently, and one who slacks off is checked less frequently?