How much to feed a burmese python

[Gareth]

I have got a 6 foot 2 inch, burmese python and i want to know how much does he needs to eat to grow at a good rate, he is about 10 months old at the moment and weighs about 9 pounds, and is eating 2 medium guinea pigs and 2 weaner rats every 10 days is that to much or to less.

Thanks.