OP may be highly skilled and disciplined, but the implication here is probably a bit exaggerated. Assuming he is talking about buying in a full $500 at a $3/5

OP may be highly skilled and disciplined, but the implication here is probably a bit exaggerated. Assuming he is talking about buying in a full $500 at a $3/5 table, that's 16 big blinds an hour (16bb/hr x 5usd/bb * 8hr = $640), which is a god-tier rate in the long run. For mere mortals with less skill and patience, it's also possible to lose the same amount the next 8hr session, resulting in a net zero for two days of work. Or, to sit break even for 8hrs with crappy unplayable hands, because you do need to play less hands to win as he mentioned.