When the meals given here stop leaving a lump in the belly we move up to the next sized prey item. Only the young boas get fed once a week. Once they are about 3-4 feet long and about 2 yrs old they move up to 2 weeks.
I do have an 8 foot female boa that went on a hunger strike (we thought sh ewas gravid) that we have on a 10 day schedule for now. When she finally puts her weight back on she will get dropped back down to 2 weeks or she will get bred.