At that age and size I would try to feed every 5 days. I wouldn't go less really even if it has been forced to fast. Seven days is ok too but when my snake was that size I was feeding every 5 days because it was so hungry and wanting to eat and needing to grow also. Then when it got bigger and showed less enthusiasm I went to 7 days and he is eating regular every 7 now, except this past time I waited because he was in shed and didn't really act hungry, and I got a perfect shed this time too. So I cleaned up the poop and skin yesterday morning and fed him last night. I know eventually I might have to go to 10-14 days but as long as he is eating fine every 7 I will try to stick to that. So anyway back to your subject. I would just increase it by one day.