It appears to be very much a personal choice how ofetn you feed and everybody seems to think there way is the best.
I personally feed on average every 10 days for my snakes which range between 10 months to 1 year old. Sometimes it might be 8 days depending on the behaviour of the snake and somtimes 14 days or even longer. My Stimsoni is in a hotter part of the house and seems to digest quicker and be much more active than my Coastals, but also does not eat as big a meal, so he normally gets fed a bit sooner, but no less than 8 days between feeds.
Some will say this is wrong, others will agree, but it is working as my snakes are growing at a good rate and appear healthy.