feeding schedule

I have a couple 06 girls that are about 3 ft long and I usually feed 1 rat per week about the same width as the snake. Right now I have an abundance of adult mice and big rats are a little scarce. My question is, Is is unhealthy to feed a mouse every other day rather than a rat once a week?

You can feed 3 to 5 mice in one feeding (rather than every other day) however if you do so you are taking the risk that they will imprint on mice and might never switch back.